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luminous

luminous

luminous Sentence Examples

  • A luminous warmth seems to enfold me.

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  • The name "firefly" is often applied also to luminous beetles of the family Lampyridae, to which the well-known glow-worm belongs.

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  • Luminous organs are described by H.

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  • the pale envelope, for oxidation, and the luminous portion, for reduction.

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  • These forces have the same period and direction as the undisturbed luminous vibrations themselves.

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  • He seemed, not a professor amongst students, but a learner amongst learners; pauses for thought alternated with luminous exposition; invention accompanied demonstration; and thus originated his Theorie des fonctions analytiques (Paris, 1797).

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  • In the dim shadow of the curtain her luminous eyes shone more brightly than usual from the tears of joy that were in them.

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  • Mysterious doctrines are ascribed by Protestants to scripture; so half of revelation is regarded as matter for blind assent, if another half is luminous in experience.

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  • When it is merely a luminous disk round the head, it is called specifically a nimbus, while the combination of nimbus and aureole is called a glory.

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  • The princess pondered awhile with a thoughtful smile and her luminous eyes lit up so that her face was entirely transformed.

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  • If we suppose the diameter of the lens to be given (2R), and its focal length f gradually to increase, the original differences of phase at the image of an infinitely distant luminous point diminish without limit.

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  • Princess Mary gazed intently into his eyes with her own luminous ones as he said this.

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  • When the interval is very small the discrepancy, though mathematically existent, produces no practical effect, and the illumination at B due to P is as important as that due to A, the intensities of the two luminous sources being supposed equal.

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  • One more effort and I reach the luminous cloud, the blue depths of the sky, the uplands of my desire.

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  • The luminous organs of these beetles consist of a specialized part of the fat-body, with an inner opaque and an outer transparent layer.

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  • Natasha was gazing at her, but seemed afraid and in doubt whether to say all she knew or not; she seemed to feel that before those luminous eyes which penetrated into the very depths of her heart, it was impossible not to tell the whole truth which she saw.

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  • Since the limitation of the width of the central band in the image of a luminous line depends upon discrepancies of phase among the secondary waves, and since the discrepancy is greatest for the waves which come from the edges of the aperture, the question arises how far the operation of the central parts of the aperture is advantageous.

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  • But during the first nineteen months of my life I had caught glimpses of broad, green fields, a luminous sky, trees and flowers which the darkness that followed could not wholly blot out.

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  • Gases, like atmospheric air, hydrogen or carbon dioxide do not become luminous if they are placed in tubes, even when heated up far beyond white heat as in the electric furnace.

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  • Gases, like atmospheric air, hydrogen or carbon dioxide do not become luminous if they are placed in tubes, even when heated up far beyond white heat as in the electric furnace.

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  • Photography is based on chemical action induced by luminous rays; apart from this practical application there are many other cases in which actinic rays occasion chemical actions; these are treated in the article Photochemistry.

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  • In Pierre, however, that comet with its long luminous tail aroused no feeling of fear.

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  • 15f) the luminous region is at the hinder end, the organ emitting the light consisting, according to H.

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  • In another respect the observations of Fraunhofer appear at first sight to be in disaccord with theory; for his measures of the diameters of the red rings, visible when white light was employed, correspond with the law applicable to dark rings, and not to the different law applicable to the luminous maxima.

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  • Princess Mary had turned toward her brother, and through her tears the loving, warm, gentle look of her large luminous eyes, very beautiful at that moment, rested on Prince Andrew's face.

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  • In theoretical investigations these problems are usually treated as of two dimensions only, everything being referred to the plane passing through the luminous point and perpendicular to the diffracting edges, supposed to be straight and parallel.

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  • It is the abode of the angels, who are wrapped in luminous garments, and who assume a sensuous form when they appear to men.

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  • The eggs and larvae of the fire-flies are luminous as well as the perfect beetles.

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  • 2s = 277-h/A f (14) e = Af /h (15) The bands are thus of the same width as those due to two infinitely narrow apertures coincident with the central lines of the retarded and unretarded streams, the subject of examination being itself a fine luminous line.

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  • 2s = 277-h/A f (14) e = Af /h (15) The bands are thus of the same width as those due to two infinitely narrow apertures coincident with the central lines of the retarded and unretarded streams, the subject of examination being itself a fine luminous line.

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  • If the subject of examination be a luminous line parallel to n, we shall obtain what we require by integrating (4) with respect to 77 from - oo to + oo.

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  • With Mademoiselle Bourienne's help the princess had maintained the conversation very well, but at the very last moment, just when he rose, she was so tired of talking of what did not interest her, and her mind was so full of the question why she alone was granted so little happiness in life, that in a fit of absent-mindedness she sat still, her luminous eyes gazing fixedly before her, not noticing that he had risen.

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  • In strictness this idea is appropriate only when the source is a luminous line, emitting cylindrical waves, such as might be obtained from a luminous point with the aid of a cylindrical lens.

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  • If one prong of each fork be furnished with a small plain mirror, and a beam of light from a luminous point be reflected successively by the two mirrors, so as to form an image on a distinct screen, when one fork alone is put in vibration, the image will move on the screen and be seen as a line of a certain length.

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  • The word actinometer is now usually applied to instruments for measuring the actinic or chemical effect of luminous rays; their action generally depends upon photochemical changes.

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  • His optical investigations are perhaps the subject in which he most contributed to the progress of science; and the lucidity of exposition which marks his Dioptrics stands conspicuous even amid the generally luminous style of his works.

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  • His optical investigations are perhaps the subject in which he most contributed to the progress of science; and the lucidity of exposition which marks his Dioptrics stands conspicuous even amid the generally luminous style of his works.

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  • And, apart from their value as historical documents, Gentz's writings are literary monuments, classical examples of nervous and luminous German prose, or of French which is a model for diplomatic style.

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  • And, apart from their value as historical documents, Gentz's writings are literary monuments, classical examples of nervous and luminous German prose, or of French which is a model for diplomatic style.

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  • Except for a few species in the New Hebrides, New Caledonia and Fiji, the luminous Elateridae are unknown in the eastern hemisphere.

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  • In his luminous subtlety and his broad undulating sweetness, his relationship with Virgil has long been manifest; he was himself aware of it.

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  • The substance to be reduced is brought into the luminous portion, where the reducing power is strongest.

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  • The substance to be reduced is brought into the luminous portion, where the reducing power is strongest.

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  • Some of the slightly cloudy Ceylon sapphires, usually of greyish-blue colour, display when cut with a convex face a chatoyant luminosity, sometimes forming a luminous star of six rays, whence they are called "star sapphires".

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  • Verdet has compared Foucault's results with theory, and has drawn the conclusion that the radius of the visible part of the image of a luminous point was equal to half the radius of the first dark ring.

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  • bright and luminous, and clearly destined to dispel the barbarisms of a tasteless age, too long superstitiously devoted to the illusions of imposing declamation."

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  • Thus in 1864 the spectroscope yielded him evidence that planetary and irregular nebulae consist of luminous gas - a conclusion tending to support the nebular hypothesis of the origin of stars and planets by condensation from glowing masses of fluid material.

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  • The most prominent idea is that being in the image of God-the God whose essence is light-he must have had a luminous body (like the angels).

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  • Though he is wanting in moderation and in luminous warmth, his tones are by no means always harsh; and as an author he ever aspired with longing after humility and love and patience, though his whole life was lived in the atmosphere of conflict.

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  • o-KovEiv, to see), that branch of physical science which has for its province the investigation of spectra, which may, for our present purpose, be regarded as the product of the resolution of composite luminous radiations into more homogeneous components.

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  • perEwpa, literally " things in the air," from yerb., beyond, and a€ipav, to lift up), a term originally applied by the ancient Greeks to many atmospheric phenomena - rainbows, halos, shooting stars, &c. - but now specially restricted to those luminous bodies known as shooting stars, falling stars, fireballs and bolides.

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  • The elaboration of these ideas in relation to the history of the civilization of the most advanced portion of the human race occupies two of the volumes of the Positive Philosophy, and has been accepted by very different schools as a masterpiece of rich, luminous, and far-reaching suggestion.

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  • His great work, the Mikhlol, consists of a grammar and lexicon; his commentaries on various parts of the Bible are admirably luminous, and, in spite of his anti-Christian remarks, have been widely used by Christian theologians and largely influenced the English authorized version of the Bible.

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  • Luminous dark eyes sparkled and flamed beneath his thick, black brows, and his large mouth and prominent nether lips were as capable of gentle sweetness as of power and set resolve.

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  • Maxwell had himself, at an early stage of his theory, tested the absorbing power of gold-leaf for light, and found that the effective conductivity for luminous vibrations must be very much greater than its steady ohmic value; it is, in fact, there a case of incipient conductivity, which is continually being undone on account of the rapid alternation of force before it is fully established.

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  • According to the best determinations the value of elm does not exceed 1.8X Io', and T is of the order of Io 15 second, the period of luminous vibrations; hence OM/M must always be less than 109 H, and therefore the strongest fields yet reached experimentally, which fall considerably short of Io %, could not change the magnetic moment M by as much as a ten-thousandth part.

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  • In many cases the subject of examination is a luminous line of uniform intensity, the various points of which are to be treated as independent sources of light.

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  • The legend of the Omophorus and Splenditeneus, rival giants who sustain earth and luminous heavens on their respective shoulders, even if it already figures in the cuneiform texts of Assyria, is yet to be traced in Mithraic bas-reliefs.

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  • The flame then appears as a long, narrow, luminous cone, the end being enveloped by a dimly visible portion of flame corresponding to that which surrounds the free flame, while there is also a dark nucleus about the wick.

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  • The flame then appears as a long, narrow, luminous cone, the end being enveloped by a dimly visible portion of flame corresponding to that which surrounds the free flame, while there is also a dark nucleus about the wick.

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  • If the image of the line be =o, the intensity at any point E, n of the diffraction pattern may be represented by ?2a2t2 S A2f2 the same law as obtains for a luminous point when horizontal directions are alone considered.

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  • This luminous judgment, it must be noted, was written by a man of acknowledged purity of life, who admired Mirabeau in early life not when he was a statesman, but when he was only a struggling literary man.

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  • Bernard Shaw, though concerned mainly with the social philosophy of the Ring, gives a luminous account of Wagner's mastery of musical movement.

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  • These reactions are practised in the following manner: A thread of asbestos is moistened and then dipped in the substance to be tested; it is then placed in the luminous point of the Bunsen flame, and a small porcelain basin containing cold water placed immediately over the asbestos.

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  • These reactions are practised in the following manner: A thread of asbestos is moistened and then dipped in the substance to be tested; it is then placed in the luminous point of the Bunsen flame, and a small porcelain basin containing cold water placed immediately over the asbestos.

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  • It has been found by Sir William Herschel and others that the definition of a telescope is often improved by stopping off a part of the central area of the object-glass; but the advantage to be obtained in this way is in no case great, and anything like a reduction of the aperture to a narrow annulus is attended by a development of the external luminous rings sufficient to outweigh any improvement due to the diminished diameter of the central area.'

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  • Theoretical resolving power can only be obtained when the whole collimator is filled with light and further (as pointed out by Lord Rayleigh in the course of discussion during a meeting of the " Optical Convention " in London, 1905) each portion of the collimator must be illuminated by each portion of the luminous source.

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  • It has been found by Sir William Herschel and others that the definition of a telescope is often improved by stopping off a part of the central area of the object-glass; but the advantage to be obtained in this way is in no case great, and anything like a reduction of the aperture to a narrow annulus is attended by a development of the external luminous rings sufficient to outweigh any improvement due to the diminished diameter of the central area.'

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  • Theoretical resolving power can only be obtained when the whole collimator is filled with light and further (as pointed out by Lord Rayleigh in the course of discussion during a meeting of the " Optical Convention " in London, 1905) each portion of the collimator must be illuminated by each portion of the luminous source.

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  • The lens may then be also dispensed with, and the whole collimator becomes unnecessary if the luminous source is narrow and at a great distance, as for instance in the case of the crescent of the sun near the second and third contact of a total solar eclipse.

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  • Compound bodies, we now know, have their own spectra, and only when dissociation occurs can the compound show the rays characteristic of the element: this perhaps was to be expected, but it came as a surprise and was not readily believed, that elements, as a rule, possess more than one spectrum according to the physical conditions under which they become luminous.

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  • Methods of Rendering Gases Luminous.

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  • This need not necessarily be interpreted as indicating the impossibility of rendering gases luminous by temperature only, for the transparency of the gas for luminous radiations may be such that the emission is too weak to be detected.

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  • It is only recently that owing to the introduction of carbon tubes heated electrically the excitement of the luminous vibrations of molecules by temperature alone has become an effective method for the study of their spectra even in the case of metals.

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  • A variety of methods to render gases luminous should be at the command of the investigator, for nearly all, show some distinctive peculiarity and any new modification generally results in fresh facts being brought to light.

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  • Adopting the definition we should have no difficulty in proving that in a vacuum tube gases may be luminous at very low temperatures, but we are doubtful whether such a conclusion is very helpful towards the elucidation of our problem.

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  • If a short length of platinum wire be inserted vertically into a lighted Bunsen burner the luminous line may be used as a slit and viewed directly through a prism.

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  • In the case of hydrogen rendered luminous in a vacuum tube we may put approximately u equal to 2000 metres per second, if the translatory motion of the luminous molecules is about the same as that at the ordinary temperature.

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  • He finds a remarkable agreement between the theoretical and experimental values, which it would be important to confirm with the more suitable instruments which are now at our disposal, as we might in this way get an estimate of the energy of translatory motion of the luminous molecules.

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  • When the amount of luminous matter is small the lines remain narrow.

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  • But this argument is not conclusive, for though the total number of hydrogen molecules is fixed when the gas is enclosed, yet the number of luminous molecules may vary with the condition.

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  • luminous may, if they do not contain the same vibrating system, behave like inert molecules.

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  • When we compare together electric discharges the intensity of which is altered by varying, the capacity, we are unable to form an opinion as to whether the effects observed are due to changes in the density of the luminous material or changes of temperature, but the experiments of Sir William and Lady Huggins 1 with the spectrum of calcium are significant in suggesting that it is really the density which is also the determining factor in cases where different concentrations and different spark discharges produce a change in the relative intensities of different lines.

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  • Hemsalech 1 have measured the velocity with which the luminous molecules are projected from metallic poles when a strong spark is passed through the air interval which separates the poles.

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  • When we now speak of the identification of spectra we like to include, wherever possible, the identification of the particular compound which is luminous and even - though we have only begun to make any progress in that direction - the differentiation between the molecular or electronic states which yield the different spectra of the same element.

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  • The fact that the gases with which we are most familiar are not rendered luminous by being heated in a tube to a temperature well above a white heat has often been a stumbling block and raised the not unreasonable doubt whether approximately homogeneous oscillations could ever be obtained by a mere thermal process.

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  • There is a vast amount of literature on the subject, but in spite of the difficulty of conceiving a luminous carbon vapour at the temperature of an ordinary carbon flame, the evidence seems to show that no other element is necessary for its production as it is found in the spectrum of pure carbon tetrachloride and certainly in cases where chlorine is excluded.

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  • If oxygen is rendered luminous by the electric discharge, a series of spectra may be made to appear.

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  • 6 With most bodies the degradation goes on rapidly and the body mainly radiates according to its temperature, but there are cases in which these intermediate stages can be observed and the body seems then to be luminous under the influence of the incident radiation.

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  • He called attention to curious phenomena occurring in the track of a luminous beam.

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  • It was thence applied to denote any luminous ring, such as that viewed around the sun or moon, or portrayed about the heads of saints.

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  • In physical science, a halo is a luminous circle, surrounding the sun or moon, with various auxiliary phenomena, and formed by the reflection and refraction of light by ice-crystals suspended in the atmosphere.

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  • The optical phenomena produced by atmospheric water and ice may be divided into two classes, according to the relative position of the luminous ring and the source of light.

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  • Passing through the luminary and parallel to the horizon, there is a white luminous circle, the parhelic circle (P), on which a number of images of the luminary appear.

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  • Luminous arcs (T), tangential to the upper and lower parts of each halo, also occur, and in the case of the inner halo, the arcs may be prolonged to form a quasi-elliptic halo.1 The physical explanation of halos originated with Rene Descartes, who ascribed their formation to the presence of icecrystals in the atmosphere.

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  • Photographs of the solar disk, taken with the H or K line, show extensive luminous clouds (flocculi) of calcium vapour, vastly greater in area than the sun-spots.

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  • papyrifera of many botanists), the discrepancies in geography, ethnology and zoology, which have been so troublesome in the past, will disappear; other features, usually considered obscure, will become luminous; and the older and less distorted sagas, at least in their main incidents, will become vivid records of actual geographic exploration."

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  • The phosphorescence produced by friction has been known since the time of Robert Boyle (1663); the diamond becomes luminous in a dark room after exposure to sunlight or in the presence of radium; and many stones phosphoresce beautifully (generally with a pale green light) when subjected to the electric discharge in a vacuum tube.

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  • Frequently an arc or band is visibly composed of innumerable short rays separated by distinctly less luminous intervals.

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  • Combinations of rays sometimes resemble a luminous fan, or a series of fans, or part of a hollow luminous cylinder.

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  • At several stations in Greenland auroral curtains have been observed when passing right overhead to narrow to a thin luminous streak, exactly as a vertical sheet of light would seem to do to one passing underneath it.

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  • In some cases changes of intensity take place round the auroral zenith, simulating the effect that would be produced by a cyclonic rotation of luminous matter.

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  • Gr eek culture had, however, both in " Hellenic " and " Hellenistic " times, a common essence, just as light is light whether in the original luminous body or in a reflection, and to describe this by the term Hellenism seems most natural.

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  • In these three volumes, which appeared at long intervals, the author's theories are not always in complete harmony, nor are they always presented in a very luminous or coherent manner, but they are marked by originality and vigour.

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  • avOi / Xcos, opposite the sun), the luminous ring or halo sometimes seen in Alpine or polar regions surrounding the shadow of the head of an observer cast upon a bank of cloud or mist.

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  • He noticed that at the summit the candle gave a very poor light, and was thereby led to investigate the effect produced on luminous flames by varying the pressure of the atmosphere in which they are burning.

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  • He found that pressure increases luminosity, so that hydrogen, for example, the flame of which in normal circumstances gives no light, burns with a luminous flame under a pressure of ten or twenty atmospheres, and the inference he drew was that the presence of solid particles is not the only factor that determines the light-giving power of a flame.

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  • In 1754 Euler communicated to the Berlin Academy a further memoir, in - which, starting from the hypothesis that light consists of vibrations excited in an elastic fluid by luminous bodies, and that the difference of colour of light is due to the greater or less frequency of these vibrations in a given time, he deduced his previous results.

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  • per second, and rendering luminous as it reached them the particles of a pre-existing nebula, whose own light had been too faint to be visible.

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  • If both the bodies are luminous, especially if they do not differ much in brilliancy, the motion of revolution is shown by a periodic doubling of the lines of the spectrum; when one body is moving towards us and the other away their spectral lines are displaced (according to Doppler's principle) in opposite directions, so that all the lines strong enough to appear in both spectra appear double; when the two bodies are in conjunction, and therefore moving transversely, their spectra are merged into one and show nothing unusual.

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  • More usually, however, only one component is sufficiently luminous for its spectrum to appear; its orbital motion is then detected by a periodic change in the absolute displacement of its spectral lines.

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  • Helium stars are generally considered to be the hottest and most luminous (in proportion to size) of all the stars.

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  • stars are in general much less intrinsically luminous than Type I., so that the stars known to be of this type must be comparatively near us, for otherwise they would appear too faint to have their spectra determined.

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  • Taking a sphere whose radius is 560 light years (a distance about equal to that of the average ninth magnitude star), it will contain: I star giving fromloo,000 to io,000 times the light of the sun 26 stars „ 1,000 „ „ 1,000 „ 100 „ 22,000 „ „ 100 „ 10 „ „ „ 140,000 „ „ IO „ I „ 430,000, ,„ I, , 0.I, , n 650,000 „ „ 0 I „ 0.01 „ .„ Whether there is an increasing number of still less luminous stars is a disputed question.

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  • The vapour of nickel carbonyl burns with a luminous flame, a cold surface depressed in the flame being covered with a black deposit of nickel.

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  • (d) The correlative process of Combination is less elaborately sketched, but in a luminous passage in the Politicus (§ 278), in explaining by means of an example the nature and of examples, Plato represents it as the bringing use P ?

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  • When an opaque body is placed between a screen and a luminous source, it casts a "shadow" on the screen.

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  • If the source be a point, such as the image formed by a lens of small focus or by a fine hole in a plate held close to a bright flame, the outline of the shadow is to be found by drawing straight lines from the luminous point so as to envelop the opaque body.

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  • When there are more luminous points than one, we have only to draw separately the geometrical shadows due to each of the sources, and then superpose them.

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  • r represents the shadow of a circular disk cast by four equal luminous points arranged as the corners of a square FIG.

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  • If we suppose the number of sources to increase indefinitely, so as finally to give the appearance of a luminous surface as the source of light, it is obvious that the degrees of darkness at different portions of the penumbra will also increase indefinitely; i.e.

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  • Thus we see at once why the shadows cast by the sun or moon are in general so much less sharp than those cast by the electric arc. For, practically, at moderate distances the arc appears as a mere luminous point.

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  • The breadth of the penumbra when the source and screen are nearly equidistant from the opaque body is equal to the diameter of the luminous source.

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  • This great investigator and luminous expositor just before that time had published his celebrated essay, Die Erhaltung der Kraft (" The Conservation of Energy "), which brought to a focus ideas which had been accumulating in consequence of the work of J.

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  • It has long been known that air and other gases at the pressure of the atmosphere were very perfect insulators, but that when they were rarefied and contained in glass tubes with platinum electrodes sealed through the glass, electricity could be passed through them under sufficient electromotive force and produced a luminous appearance known as the electric glow discharge.

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  • The particular details of the phenomena observed will be found described in the article Electric conduction (§ The main fact discovered by researches of Plucker, Hittorf and Crookes was that in a vacuum tube containing extremely rarefied air or other gas, a luminous discharge takes place from the negative electrode which proceeds in lines normal to the surface of the negative electrode and renders phosphorescent both the glass envelope and other objects placed in the vacuum tube when it falls upon them.

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  • 21: - Prerogative Instances, Supports of Induction, Rectification of Induction, Varying the Investigation according to the Nature of the Subject, Prerogative Natures, Limits of Investigation, Application to Practice, Preparations for Investigation, the Ascending and Descending Scale of Axioms. The remainder of the Organum is devoted to a consideration of the twenty-seven classes of Prerogative Instances, and though it contains much that is both luminous and helpful, it adds little to our knowledge of what constitutes the Baconian method.

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  • He investigated the optical constants of the eye, measured by his invention, the ophthalmometer, the radii of curvature of the crystalline lens for near and far vision, explained the mechanism of accommodation by which the eye can focus within certain limits, discussed the phenomena of colour vision, and gave a luminous account of the movements of the eyeballs so as to secure single vision with two eyes.

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  • The course of the rays in the meridional section is no longer symmetrical to the principal ray of the pencil; and on an intercepting plane there appears, instead of a luminous point, a patch of light, not symmetrical about a point, and often exhibiting a resemblance to a comet having its tail directed towards or away from the axis.

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  • 12 a and developed the view that induction is simply an inverse employment of deduction; he treated in a luminous manner the general theory of probability, and the relation between probability and induction; and his knowledge of the various natural sciences enabled him throughout to relieve the abstract character of logical doctrine by concrete scientific illustrations, often worked out in great detail.

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  • Thus, a form termed Photobacterium phosphorescens by Beyerinck will absorb maltose, and will become luminous if that sugar is present, whereas P. Pflugeri is indifferent to maltose.

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  • a yeast, which saccharifies starch, it is possible to tell whether maltose or levulose and fructose are formed; if the former, only those plates containing P. phosphorescens will become luminous; if the latter, only those containing P. Pflugeri.

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  • Certainly the excellent seneschal has not stinted himself of comparisons here, yet they can hardly be said to be luminous.

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  • In the Ostracoda and Copepoda the phosphorescence, as already mentioned, is due to glands which produce a luminous secretion, and this is the case also in certain members of the Schizopoda and Decapoda.

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  • In optics, the term caustic is given to the envelope of luminous rays after reflection or refraction; in the first case the envelope is termed a catacaustic, in the second a diacaustic. Catacaustics are to be observed as bright curves when light is allowed to fall upon a polished riband of steel, such as a watch-spring, placed on a table, and by varying the form of the spring and moving the source of light, a variety of patterns may be obtained.

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  • The simplest case of a caustic curve is when the reflecting surface is a circle, and the luminous rays emanate from a point on the circumference.

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  • 1 AQP be the reflecting circle Caustics having C as centre, P the luminous point, and PQ any incident ray, and we join CQ, it follows, by the law of the b efiection.

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  • The Cartesian equation to the caustic produced by reflection at a circle of rays diverging from any point was obtained by Joseph Louis Lagrange; it may be expressed in theform 1(4,2_ a2) (x 2+ y2) - 2a 2 cx - a 2 c 2 1 3 = 2 7 a4c2y2 (x2 + y2 - c2)2, where a is the radius of the reflecting circle, and c the distance of the luminous point from the centre of the circle.

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  • It is usually the case that the secondary caustic is easier to determine than the caustic, and hence, when determined, it affords a ready means for deducing, the primary caustic. It may be shown by geometrical considerations that the secondary caustic is a curve similar to the first positive pedal of the reflecting curve, of twice the linear dimensions, with respect to the luminous point.

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  • The simplest instance of a caustic by refraction (or diacaustic) is when luminous rays issuing from a point are refracted at a straight line.

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  • tive than the first, is an ellipse having the luminous point for a focus, and its centre at the foot of the perpendicular from the luminous point to the refracting line.

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  • There he spent the remainder of his life, a devoted husband, a wise and tender father, a careful householder, a virtuous villager, a friendly neighbour, and, spite of all his disclaimers, the central and luminous figure among the Transcendentalists.

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  • He was the first to use the vacuum tube with the capillary part now called a Geissler's tube, by means of which the luminous intensity of feeble electric discharges was raised sufficiently to allow of spectroscopic investigation.

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  • If a luminous body is surrounded by empty space, the light which it emits suffers no loss of energy as it travels outwards.

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  • Thus black substances such as charcoal are very luminous when heated.

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  • On the other hand, those substances which either are good reflectors or good transmitters, are not so luminous at the same temperature; for instance, melted silver, which reflects well, is not so luminous as carbon at the same temperature, and common salt, which is very transparent for most kinds of radiation, when poured in a fused condition out of a bright red-hot crucible, looks almost like water, showing only a faint red glow for a moment or two.

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  • It burns with a brightly luminous flame, and is spontaneously inflammable at about too° C. When mixed with oxygen it combines explosively if the mixture be under diminished pressure, and is violently decomposed by the halogens.

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  • It spontaneously inflames in air or oxygen; and when the gas is issuing from a jet into air the flame is greyish green, with a faintly luminous and yellow tip; the flame is probably one of the coldest known.

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  • The phosphorus used in the British pharma copoeia is obtained from calcium phosphate, and is a waxlike non-metallic substance soluble in oils and luminous in the dark.

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  • The name has no reference to the appearance of the body to the eye; when emitting energy, its radiations will he of all wave-lengths, and if intense enough will appeal to the eye as luminous between about wave-lengths 7600 and 4000 tenth-metres; this intensity is a question of temperature, and as it is exquisitely inappropriate to speak of the bulk of the solar radiations as black, the writer will speak instead of amorphous radiations from an ideal radiator.

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  • It will be seen that the maximum ordinates lie upon the curve A9 = constant dotted in the figure, and so, as the temperature of the ideal body rises, the wave-length of most intense radiation shifts from the infra-red X towards the luminous part of the spectrum.

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  • It is a colourless liquid which boils at 11 -12° C., and its vapour burns with a luminous flame.

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  • Minium appeareth there of any colour indifferently, with which 'tis illustrated, but yet most luminous in red, and so Bise appeareth indifferently of any colour with which 'tis illustrated, but yet most luminous in blew.

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  • The Edinburgh Review of April 1903 contains a luminous essay; and Mr Bryce has a chapter on Acton in his Studies of Contemporary Biography (1903).

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  • George Grenville, whom the Rockinghams had displaced, and who was bitterly incensed at their formal reversal of his policy, printed a pamphlet to demonstrate his own wisdom and statesmanship. Burke replied in his Observations on a late Publication on the Present State of the Nation (1769), in which he showed for the first time that he had not only as much knowledge of commerce and finance, and as firm a hand, in dealing with figures as Grenville himself, but also a broad, general and luminous way of conceiving and treating politics, in which neither then nor since has he had any rival among English publicists.

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  • So a black whirl and torment of rapine, violence and fraud was encircling the Western world, as a life went out which, notwithstanding some eccentricities and some aberrations, had made great tides in human destiny very luminous.

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  • The work on [[Trigonometry]] and Double Algebra (1849) contains in the latter part a most luminous and philosophical view of existing and possible systems of symbolic calculus.

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  • Prior to 1691, however, Dr John Clayton, dean of Kildare, filled bladders with inflammable gas obtained by the distillation of coal, and showed that on pricking the bladders and applying a light to the escaping gas it burnt with a luminous flame, and in 1726 Stephen Hales published the fact that by the distillation of 158 grains of Newcastle coal, 180 cub.

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  • rendered luminous by passing it through chambers in which oils are decomposed by heat, the mixture being made so as to give an illuminating value of 22 to 25 candles.

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  • Both rock-salt and carbon bisulphide are extremely transparent to the luminous and also to the infra-red rays The iodine in the solution, however, has the property of absorbing the luminous rays, while transmitting the infra-red rays copiously, so that in sufficient thicknesses the solution appears nearly black.

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  • Since the rays used by Tyndall in these experiments are similar to those emitted by a heated body which is not hot enough to be luminous, it might be thought that the radiation, say from a hot kettle, could be concentrated to a focus and employed to render a small body luminous.

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  • Tyndall used the dark rays from a luminous source, which are emitted in a highly concentrated form, so that it was possible to obtain a high temperature, which was, however, much lower than that of the source.

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  • So Euripides describes the inhabitants as "ever walking gracefully through the most luminous ether" (Med.

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  • The changes which the aspect of the heaven undergoes, as we travel North and South, are so well known that they need not be described in detail here; but a general statement of them will give a luminous idea of the geometrical co-ordinates we have described.

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  • A luminous idea of the nature of these two classes of variation may be gained by conceiving of the, motion of a ship, floating on an ocean affected by a long ground swell.

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  • That is to say, they stop out just those sections of white light transmitted through them which form their own special luminous badges.

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  • A luminous idea of the geometrical relations of the moon, earth and sun will be gained from the figure, by imagining the sun to be moved towards the left, and placed at a distance of 20 ft.

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  • Thus light, pressure, or mechanical stimulation acting on the retina and optic nerve invariably produces luminous impressions.

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  • Indeed no man ever concentrated authority to such a point, nor showed mental abilities at all comparable to his: an extraordinary power of work, prodigious memory for details and fine judgment in their selection; together with a luminous decision and a simple and rapid conception, all placed at the disposal of a sovereign will.

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  • In Egyptian mythology the serpent Apap with an army of monsters strives daily to arrest the course of the boat of the luminous gods.

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  • The use of such furnaces has very considerably diminished, owing to the general introduction of coal-gas for heating purposes in laboratories, which has been rendered possible by the invention of the Bunsen burner, in which the mixture of air and gas giving the least luminous but most powerfully heating flame is effected automatically by the effluent gas.

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  • Remember the more luminous star has an absolute magnitude that is less than a fainter star's absolute magnitude!

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  • accretion of matter onto black holes make them luminous?

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  • He had a nice big Afro of ginger hair and had a habit of wearing luminous yellow and green odd socks.

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  • Among the spiral arms are bright, luminous, slightly pink blobs.

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  • During the outburst event, the normally faint star suddenly brightened, becoming 600,000 times more luminous than our Sun.

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  • The dial is luminous and has large markings with minimal dial clutter for maximum legibility.

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  • We know that during a total eclipse of the sun the moon is surrounded by a luminous corona.

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  • crouched together into the smallest possible compass, his luminous green eyes turned over his shoulder regarding me.

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  • dial with large luminous numerals (neon blue glow ).

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  • I sighed and studied the luminous dots and lines on my wrist.

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  • I think perhaps that a poisonous effluvium is emitted from the luminous substance.

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  • Clearly the luminous flux of a light source is of little value in isolation; the light will be changed by the optics.

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  • gesso ground enables light to reflect back from the whiteness of the surface to give a luminous quality.

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  • glow In The Dark Luminous vibrator A 5 " glow in the dark vibrator.

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  • heavyset figure with large luminous eyes.

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  • Then we are escaping hordes of midges up An Teallach, on a day of playful breezes and luminous skies.

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  • They gave the impression of about 30 luminous beads, arranged in a crescent shape.

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  • Candela The candela (cd) is the SI unit of luminous intensity.

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  • leeward shore, 11 miles of beach are littered with tiny shells that give it a luminous pink glow.

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  • luminous in X-rays than the same cluster simulated without cooling.

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  • It is celebrated by making the place luminous by arranging lights and burning the crackers.

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  • luminous flux of a light source is of little value in isolation; the light will be changed by the optics.

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  • luminous intensity in any direction.

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  • luminous complexion!

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  • luminous discreet markings.

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  • luminous efficacy, i.e., the useful visible light in relation to the total energy of the radiation is high.

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  • luminous frost or matte effect to impart depth to the eyes without making them too heavy.

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  • It was visible, almost luminous, almost alive.

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  • The lighting field, like the rest of the dial markings is highly luminous.

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  • These hot, very luminous stars do not live long enough to move away from where they were formed.

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  • The colors are not so luminous as on other occasions; their tones are mostly a brownish-red, dirty violet.

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  • The Arabic numbers are in white and not luminous.

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  • In fact, of course, apart from a faintly luminous fannish aura, most fans look almost human.

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  • The plain become luminous, the luminous, gods.

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  • A day whose dawn is part of history, And whose evening is made luminous by Muhammad!

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  • Gradually the surrounds atmosphere seemed to fill with sensations, and grew luminous.

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  • She does not look glorious, shining or even radiant, she looks luminous.

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  • Beauty Estée Lauder's Pure Illuminations autumn collection features iridescent, shimmering colors that change with the light and make the skin appear luminous.

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  • Has luminous filled hands and hour indications, classic styled bracelet and glass display back.

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  • luminous flux of a light source is of little value in isolation; the light will be changed by the optics.

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  • Measurements include directional luminous intensity, illuminance of lamps and meters, luminance of sources and meters and total luminous flux.

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  • Beautiful, colorful and luminous mandalas by contemporary mandala artist.

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  • Built-in magnifying lens and luminous markings for night navigation are other important features for the most demanding users.

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  • By the late 1890s Cézanne's mastery of the medium allowed for a range of highly nuanced luminous effects.

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  • But it nearly wasn't so: Myers originally voiced the luminous green ogre using his native Canadian accent.

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  • ontic priority to the ' sonorous ' rather than the ' luminous ' Ground of Being.

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  • Cone The more luminous part of a flame, which is adjacent to the nozzle orifice.

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  • radiant, luminous complexion!

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  • She does not look glorious, shining or even radiant, she looks luminous.

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  • This chaotic motion may be caused by the powerful ultraviolet radiation from the luminous, massive stars.

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  • The luminous trail led toward a large sarcophagus, dominating the oldest part of the graveyard.

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  • Color and aspect: clear, luminous, crystalline pale gold spangled with flashes of green sparkle and amber glitter.

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  • stuttered into life, painting a luminous topcoat of normality on the silent kitchen.

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  • A long, luminous sunbeam fell across the landing, touching the edge of her hair till it glimmered like bronze afire.

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  • The brightest known stars in our galaxy are very luminous red supergiants.

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  • I pulled my oxygen mask down and said: " But I've got luminous testicles!

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  • The subsidiary seconds are at 9. It still has bright tritium luminous dial markings.

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  • Glow In The dark Luminous vibrator A 5 " glow in the dark vibrator.

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  • A person who is lit from within, reflecting the natural worlds ' own luminous, infinite wisdom.

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  • An electric fly zapper, insurance rated fire extinguishers and fire blanket together with luminous signs and First Aid stations.

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  • These forces have the same period and direction as the undisturbed luminous vibrations themselves.

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  • Except for a few species in the New Hebrides, New Caledonia and Fiji, the luminous Elateridae are unknown in the eastern hemisphere.

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  • Beneath the cuticle of these regions are situated the luminous organs, consisting of layers of cells which may be regarded as a specialized portion of the fat-body) Both the male and female fireflies emit light, as well as their larvae and eggs, the egg being luminous even while still in the ovary.

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  • The name "firefly" is often applied also to luminous beetles of the family Lampyridae, to which the well-known glow-worm belongs.

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  • In any case the discovery is to some extent his own, for his proof of the law is founded upon the theory that light is the propagation of the aether in straight lines from the sun or luminous body to the eye (see Light).

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  • aura, air), the radiance of luminous cloud which, in paintings of sacred personages, is represented as surrounding the whole figure.

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  • When it is merely a luminous disk round the head, it is called specifically a nimbus, while the combination of nimbus and aureole is called a glory.

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  • The aqueous vapour in the atmosphere is transparent to luminous but opaque to obscure heat-rays.

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  • His great work, the Mikhlol, consists of a grammar and lexicon; his commentaries on various parts of the Bible are admirably luminous, and, in spite of his anti-Christian remarks, have been widely used by Christian theologians and largely influenced the English authorized version of the Bible.

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  • Mysterious doctrines are ascribed by Protestants to scripture; so half of revelation is regarded as matter for blind assent, if another half is luminous in experience.

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  • 15f) the luminous region is at the hinder end, the organ emitting the light consisting, according to H.

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  • The luminous organs of these beetles consist of a specialized part of the fat-body, with an inner opaque and an outer transparent layer.

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  • The eggs and larvae of the fire-flies are luminous as well as the perfect beetles.

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  • Luminous organs are described by H.

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  • This luminous judgment, it must be noted, was written by a man of acknowledged purity of life, who admired Mirabeau in early life not when he was a statesman, but when he was only a struggling literary man.

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  • Photography is based on chemical action induced by luminous rays; apart from this practical application there are many other cases in which actinic rays occasion chemical actions; these are treated in the article Photochemistry.

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  • Bernard Shaw, though concerned mainly with the social philosophy of the Ring, gives a luminous account of Wagner's mastery of musical movement.

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  • It is the abode of the angels, who are wrapped in luminous garments, and who assume a sensuous form when they appear to men.

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  • According to the best determinations the value of elm does not exceed 1.8X Io', and T is of the order of Io 15 second, the period of luminous vibrations; hence OM/M must always be less than 109 H, and therefore the strongest fields yet reached experimentally, which fall considerably short of Io %, could not change the magnetic moment M by as much as a ten-thousandth part.

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  • He seemed, not a professor amongst students, but a learner amongst learners; pauses for thought alternated with luminous exposition; invention accompanied demonstration; and thus originated his Theorie des fonctions analytiques (Paris, 1797).

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  • In many cases the subject of examination is a luminous line of uniform intensity, the various points of which are to be treated as independent sources of light.

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  • If the image of the line be =o, the intensity at any point E, n of the diffraction pattern may be represented by ?2a2t2 S A2f2 the same law as obtains for a luminous point when horizontal directions are alone considered.

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  • The distribution of illumination in the image of a luminous line is shown by the curve ABC (fig.

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  • Since the limitation of the width of the central band in the image of a luminous line depends upon discrepancies of phase among the secondary waves, and since the discrepancy is greatest for the waves which come from the edges of the aperture, the question arises how far the operation of the central parts of the aperture is advantageous.

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  • Verdet has compared Foucault's results with theory, and has drawn the conclusion that the radius of the visible part of the image of a luminous point was equal to half the radius of the first dark ring.

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  • bouring point P, also self luminous, in the plane of the object, the waves which issue from it will arrive at B with phases no longer absolutely concordant, and the discrepancy of phase will increase as the interval AP 2 " Man kann daraus schliessen, was moglicher Weise durch Mikroskope noch zu sehen ist.

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  • When the interval is very small the discrepancy, though mathematically existent, produces no practical effect, and the illumination at B due to P is as important as that due to A, the intensities of the two luminous sources being supposed equal.

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  • In another respect the observations of Fraunhofer appear at first sight to be in disaccord with theory; for his measures of the diameters of the red rings, visible when white light was employed, correspond with the law applicable to dark rings, and not to the different law applicable to the luminous maxima.

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  • If we suppose the diameter of the lens to be given (2R), and its focal length f gradually to increase, the original differences of phase at the image of an infinitely distant luminous point diminish without limit.

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  • If the subject of examination be a luminous line parallel to n, we shall obtain what we require by integrating (4) with respect to 77 from - oo to + oo.

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  • In theoretical investigations these problems are usually treated as of two dimensions only, everything being referred to the plane passing through the luminous point and perpendicular to the diffracting edges, supposed to be straight and parallel.

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  • In strictness this idea is appropriate only when the source is a luminous line, emitting cylindrical waves, such as might be obtained from a luminous point with the aid of a cylindrical lens.

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  • perEwpa, literally " things in the air," from yerb., beyond, and a€ipav, to lift up), a term originally applied by the ancient Greeks to many atmospheric phenomena - rainbows, halos, shooting stars, &c. - but now specially restricted to those luminous bodies known as shooting stars, falling stars, fireballs and bolides.

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  • Luminous dark eyes sparkled and flamed beneath his thick, black brows, and his large mouth and prominent nether lips were as capable of gentle sweetness as of power and set resolve.

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  • (See Radiation.) The word actinometer is now usually applied to instruments for measuring the actinic or chemical effect of luminous rays; their action generally depends upon photochemical changes (see Photo-Chemistry).

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  • The elaboration of these ideas in relation to the history of the civilization of the most advanced portion of the human race occupies two of the volumes of the Positive Philosophy, and has been accepted by very different schools as a masterpiece of rich, luminous, and far-reaching suggestion.

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  • In his luminous subtlety and his broad undulating sweetness, his relationship with Virgil has long been manifest; he was himself aware of it.

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  • bright and luminous, and clearly destined to dispel the barbarisms of a tasteless age, too long superstitiously devoted to the illusions of imposing declamation."

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  • Thus in 1864 the spectroscope yielded him evidence that planetary and irregular nebulae consist of luminous gas - a conclusion tending to support the nebular hypothesis of the origin of stars and planets by condensation from glowing masses of fluid material.

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  • If one prong of each fork be furnished with a small plain mirror, and a beam of light from a luminous point be reflected successively by the two mirrors, so as to form an image on a distinct screen, when one fork alone is put in vibration, the image will move on the screen and be seen as a line of a certain length.

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  • The most prominent idea is that being in the image of God-the God whose essence is light-he must have had a luminous body (like the angels).

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  • In 1865 Dellinger wrote: " The Ultramontane view can be summarized in a single, concise, and luminous proposition; but out of this proposition are evolved a doctrine and a view that embrace not merely religion and the Church, but science and the state, politics, morals and the social order - in a word, the whole intellectual life of men and nations.

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  • These sulphides form the basis of Balmain's luminous paint.

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  • Light from stars at unfathomable distances reaches us in such quantity as to suggest that space itself is absolutely transparent, leaving open the question as to whether there is enough matter scattered through it to absorb a sensible part of the light in its journey of years from the luminous body.

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  • Hagen that for dark heat rays of only about ten times the wave-length of luminous radiation, the properties of metals are determined by their electric resistance alone, which then masks all resonance due to periods of free vibration of the molecules; and, moreover, that the resistance for such alternations is practically the same as the ohmic resistance for ordinary steady currents.

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  • Maxwell had himself, at an early stage of his theory, tested the absorbing power of gold-leaf for light, and found that the effective conductivity for luminous vibrations must be very much greater than its steady ohmic value; it is, in fact, there a case of incipient conductivity, which is continually being undone on account of the rapid alternation of force before it is fully established.

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  • In his optical researches, Optiska Undersiikningar, presented to the Stockholm Academy in 1853, he not only pointed out that the electric spark yields two superposed spectra, one from the metal of the electrode and the other from the gas in which it passes, but deduced from Euler's theory of resonance that an incandescent gas emits luminous rays of the same refrangibility as those which it can absorb.

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  • The legend of the Omophorus and Splenditeneus, rival giants who sustain earth and luminous heavens on their respective shoulders, even if it already figures in the cuneiform texts of Assyria, is yet to be traced in Mithraic bas-reliefs.

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  • Though he is wanting in moderation and in luminous warmth, his tones are by no means always harsh; and as an author he ever aspired with longing after humility and love and patience, though his whole life was lived in the atmosphere of conflict.

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  • Some of the slightlycloudy Ceylon sapphires, usually of greyish-blue colour, display when cut with a convex face a chatoyant luminosity, sometimes forming a luminous star of six rays, whence they are called "starsapphires" (see Asteria).

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  • If the flame of a candle or lamp be closely examined, it will be seen to consist of four parts - (a) a deep blue ring at the base, (b) a dark cone in the centre, (c) a luminous portion round this, and (d) an exterior pale blue envelope (see Flame).

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  • the pale envelope, for oxidation, and the luminous portion, for reduction.

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  • o-KovEiv, to see), that branch of physical science which has for its province the investigation of spectra, which may, for our present purpose, be regarded as the product of the resolution of composite luminous radiations into more homogeneous components.

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  • Compound bodies, we now know, have their own spectra, and only when dissociation occurs can the compound show the rays characteristic of the element: this perhaps was to be expected, but it came as a surprise and was not readily believed, that elements, as a rule, possess more than one spectrum according to the physical conditions under which they become luminous.

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  • The lens may then be also dispensed with, and the whole collimator becomes unnecessary if the luminous source is narrow and at a great distance, as for instance in the case of the crescent of the sun near the second and third contact of a total solar eclipse.

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  • Methods of Rendering Gases Luminous.

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  • This need not necessarily be interpreted as indicating the impossibility of rendering gases luminous by temperature only, for the transparency of the gas for luminous radiations may be such that the emission is too weak to be detected.

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  • It is only recently that owing to the introduction of carbon tubes heated electrically the excitement of the luminous vibrations of molecules by temperature alone has become an effective method for the study of their spectra even in the case of metals.

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  • A variety of methods to render gases luminous should be at the command of the investigator, for nearly all, show some distinctive peculiarity and any new modification generally results in fresh facts being brought to light.

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  • Adopting the definition we should have no difficulty in proving that in a vacuum tube gases may be luminous at very low temperatures, but we are doubtful whether such a conclusion is very helpful towards the elucidation of our problem.

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  • If a short length of platinum wire be inserted vertically into a lighted Bunsen burner the luminous line may be used as a slit and viewed directly through a prism.

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  • In the case of hydrogen rendered luminous in a vacuum tube we may put approximately u equal to 2000 metres per second, if the translatory motion of the luminous molecules is about the same as that at the ordinary temperature.

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  • He finds a remarkable agreement between the theoretical and experimental values, which it would be important to confirm with the more suitable instruments which are now at our disposal, as we might in this way get an estimate of the energy of translatory motion of the luminous molecules.

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  • When the amount of luminous matter is small the lines remain narrow.

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  • But this argument is not conclusive, for though the total number of hydrogen molecules is fixed when the gas is enclosed, yet the number of luminous molecules may vary with the condition.

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  • luminous may, if they do not contain the same vibrating system, behave like inert molecules.

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  • When we compare together electric discharges the intensity of which is altered by varying, the capacity, we are unable to form an opinion as to whether the effects observed are due to changes in the density of the luminous material or changes of temperature, but the experiments of Sir William and Lady Huggins 1 with the spectrum of calcium are significant in suggesting that it is really the density which is also the determining factor in cases where different concentrations and different spark discharges produce a change in the relative intensities of different lines.

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  • Hemsalech 1 have measured the velocity with which the luminous molecules are projected from metallic poles when a strong spark is passed through the air interval which separates the poles.

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  • When we now speak of the identification of spectra we like to include, wherever possible, the identification of the particular compound which is luminous and even - though we have only begun to make any progress in that direction - the differentiation between the molecular or electronic states which yield the different spectra of the same element.

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  • The fact that the gases with which we are most familiar are not rendered luminous by being heated in a tube to a temperature well above a white heat has often been a stumbling block and raised the not unreasonable doubt whether approximately homogeneous oscillations could ever be obtained by a mere thermal process.

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  • There is a vast amount of literature on the subject, but in spite of the difficulty of conceiving a luminous carbon vapour at the temperature of an ordinary carbon flame, the evidence seems to show that no other element is necessary for its production as it is found in the spectrum of pure carbon tetrachloride and certainly in cases where chlorine is excluded.

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  • If oxygen is rendered luminous by the electric discharge, a series of spectra may be made to appear.

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  • 6 With most bodies the degradation goes on rapidly and the body mainly radiates according to its temperature, but there are cases in which these intermediate stages can be observed and the body seems then to be luminous under the influence of the incident radiation.

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  • He called attention to curious phenomena occurring in the track of a luminous beam.

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  • It was thence applied to denote any luminous ring, such as that viewed around the sun or moon, or portrayed about the heads of saints.

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  • In physical science, a halo is a luminous circle, surrounding the sun or moon, with various auxiliary phenomena, and formed by the reflection and refraction of light by ice-crystals suspended in the atmosphere.

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  • The optical phenomena produced by atmospheric water and ice may be divided into two classes, according to the relative position of the luminous ring and the source of light.

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  • Passing through the luminary and parallel to the horizon, there is a white luminous circle, the parhelic circle (P), on which a number of images of the luminary appear.

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  • Luminous arcs (T), tangential to the upper and lower parts of each halo, also occur, and in the case of the inner halo, the arcs may be prolonged to form a quasi-elliptic halo.1 The physical explanation of halos originated with Rene Descartes, who ascribed their formation to the presence of icecrystals in the atmosphere.

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  • Photographs of the solar disk, taken with the H or K line, show extensive luminous clouds (flocculi) of calcium vapour, vastly greater in area than the sun-spots.

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  • papyrifera of many botanists), the discrepancies in geography, ethnology and zoology, which have been so troublesome in the past, will disappear; other features, usually considered obscure, will become luminous; and the older and less distorted sagas, at least in their main incidents, will become vivid records of actual geographic exploration."

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  • The phosphorescence produced by friction has been known since the time of Robert Boyle (1663); the diamond becomes luminous in a dark room after exposure to sunlight or in the presence of radium; and many stones phosphoresce beautifully (generally with a pale green light) when subjected to the electric discharge in a vacuum tube.

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  • Frequently an arc or band is visibly composed of innumerable short rays separated by distinctly less luminous intervals.

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  • Combinations of rays sometimes resemble a luminous fan, or a series of fans, or part of a hollow luminous cylinder.

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  • At several stations in Greenland auroral curtains have been observed when passing right overhead to narrow to a thin luminous streak, exactly as a vertical sheet of light would seem to do to one passing underneath it.

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  • In some cases changes of intensity take place round the auroral zenith, simulating the effect that would be produced by a cyclonic rotation of luminous matter.

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  • Gr eek culture had, however, both in " Hellenic " and " Hellenistic " times, a common essence, just as light is light whether in the original luminous body or in a reflection, and to describe this by the term Hellenism seems most natural.

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  • In these three volumes, which appeared at long intervals, the author's theories are not always in complete harmony, nor are they always presented in a very luminous or coherent manner, but they are marked by originality and vigour.

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  • avOi / Xcos, opposite the sun), the luminous ring or halo sometimes seen in Alpine or polar regions surrounding the shadow of the head of an observer cast upon a bank of cloud or mist.

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  • He noticed that at the summit the candle gave a very poor light, and was thereby led to investigate the effect produced on luminous flames by varying the pressure of the atmosphere in which they are burning.

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  • He found that pressure increases luminosity, so that hydrogen, for example, the flame of which in normal circumstances gives no light, burns with a luminous flame under a pressure of ten or twenty atmospheres, and the inference he drew was that the presence of solid particles is not the only factor that determines the light-giving power of a flame.

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  • In 1754 Euler communicated to the Berlin Academy a further memoir, in - which, starting from the hypothesis that light consists of vibrations excited in an elastic fluid by luminous bodies, and that the difference of colour of light is due to the greater or less frequency of these vibrations in a given time, he deduced his previous results.

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  • STAR, the general term for the luminous bodies seen in the heavens; used also by analogy for star-shaped ornaments (see Medal; Orders and Decorations) or other objects, and figuratively for persons of conspicuous brilliance.

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  • per second, and rendering luminous as it reached them the particles of a pre-existing nebula, whose own light had been too faint to be visible.

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  • If both the bodies are luminous, especially if they do not differ much in brilliancy, the motion of revolution is shown by a periodic doubling of the lines of the spectrum; when one body is moving towards us and the other away their spectral lines are displaced (according to Doppler's principle) in opposite directions, so that all the lines strong enough to appear in both spectra appear double; when the two bodies are in conjunction, and therefore moving transversely, their spectra are merged into one and show nothing unusual.

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  • More usually, however, only one component is sufficiently luminous for its spectrum to appear; its orbital motion is then detected by a periodic change in the absolute displacement of its spectral lines.

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  • Helium stars are generally considered to be the hottest and most luminous (in proportion to size) of all the stars.

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  • stars are in general much less intrinsically luminous than Type I., so that the stars known to be of this type must be comparatively near us, for otherwise they would appear too faint to have their spectra determined.

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  • Taking a sphere whose radius is 560 light years (a distance about equal to that of the average ninth magnitude star), it will contain: I star giving fromloo,000 to io,000 times the light of the sun 26 stars „ 1,000 „ „ 1,000 „ 100 „ 22,000 „ „ 100 „ 10 „ „ „ 140,000 „ „ IO „ I „ 430,000, ,„ I, , 0.I, , n 650,000 „ „ 0 I „ 0.01 „ .„ Whether there is an increasing number of still less luminous stars is a disputed question.

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  • The vapour of nickel carbonyl burns with a luminous flame, a cold surface depressed in the flame being covered with a black deposit of nickel.

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  • (d) The correlative process of Combination is less elaborately sketched, but in a luminous passage in the Politicus (§ 278), in explaining by means of an example the nature and of examples, Plato represents it as the bringing use P ?

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  • When an opaque body is placed between a screen and a luminous source, it casts a "shadow" on the screen.

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  • If the source be a point, such as the image formed by a lens of small focus or by a fine hole in a plate held close to a bright flame, the outline of the shadow is to be found by drawing straight lines from the luminous point so as to envelop the opaque body.

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  • When there are more luminous points than one, we have only to draw separately the geometrical shadows due to each of the sources, and then superpose them.

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  • r represents the shadow of a circular disk cast by four equal luminous points arranged as the corners of a square FIG.

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  • If we suppose the number of sources to increase indefinitely, so as finally to give the appearance of a luminous surface as the source of light, it is obvious that the degrees of darkness at different portions of the penumbra will also increase indefinitely; i.e.

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  • Thus we see at once why the shadows cast by the sun or moon are in general so much less sharp than those cast by the electric arc. For, practically, at moderate distances the arc appears as a mere luminous point.

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  • The breadth of the penumbra when the source and screen are nearly equidistant from the opaque body is equal to the diameter of the luminous source.

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  • This great investigator and luminous expositor just before that time had published his celebrated essay, Die Erhaltung der Kraft (" The Conservation of Energy "), which brought to a focus ideas which had been accumulating in consequence of the work of J.

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  • It has long been known that air and other gases at the pressure of the atmosphere were very perfect insulators, but that when they were rarefied and contained in glass tubes with platinum electrodes sealed through the glass, electricity could be passed through them under sufficient electromotive force and produced a luminous appearance known as the electric glow discharge.

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  • The particular details of the phenomena observed will be found described in the article Electric conduction (§ The main fact discovered by researches of Plucker, Hittorf and Crookes was that in a vacuum tube containing extremely rarefied air or other gas, a luminous discharge takes place from the negative electrode which proceeds in lines normal to the surface of the negative electrode and renders phosphorescent both the glass envelope and other objects placed in the vacuum tube when it falls upon them.

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  • 21: - Prerogative Instances, Supports of Induction, Rectification of Induction, Varying the Investigation according to the Nature of the Subject, Prerogative Natures, Limits of Investigation, Application to Practice, Preparations for Investigation, the Ascending and Descending Scale of Axioms. The remainder of the Organum is devoted to a consideration of the twenty-seven classes of Prerogative Instances, and though it contains much that is both luminous and helpful, it adds little to our knowledge of what constitutes the Baconian method.

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  • He investigated the optical constants of the eye, measured by his invention, the ophthalmometer, the radii of curvature of the crystalline lens for near and far vision, explained the mechanism of accommodation by which the eye can focus within certain limits, discussed the phenomena of colour vision, and gave a luminous account of the movements of the eyeballs so as to secure single vision with two eyes.

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  • The course of the rays in the meridional section is no longer symmetrical to the principal ray of the pencil; and on an intercepting plane there appears, instead of a luminous point, a patch of light, not symmetrical about a point, and often exhibiting a resemblance to a comet having its tail directed towards or away from the axis.

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  • 12 a and developed the view that induction is simply an inverse employment of deduction; he treated in a luminous manner the general theory of probability, and the relation between probability and induction; and his knowledge of the various natural sciences enabled him throughout to relieve the abstract character of logical doctrine by concrete scientific illustrations, often worked out in great detail.

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  • Thus, a form termed Photobacterium phosphorescens by Beyerinck will absorb maltose, and will become luminous if that sugar is present, whereas P. Pflugeri is indifferent to maltose.

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  • a yeast, which saccharifies starch, it is possible to tell whether maltose or levulose and fructose are formed; if the former, only those plates containing P. phosphorescens will become luminous; if the latter, only those containing P. Pflugeri.

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  • Certainly the excellent seneschal has not stinted himself of comparisons here, yet they can hardly be said to be luminous.

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  • In the Ostracoda and Copepoda the phosphorescence, as already mentioned, is due to glands which produce a luminous secretion, and this is the case also in certain members of the Schizopoda and Decapoda.

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  • In optics, the term caustic is given to the envelope of luminous rays after reflection or refraction; in the first case the envelope is termed a catacaustic, in the second a diacaustic. Catacaustics are to be observed as bright curves when light is allowed to fall upon a polished riband of steel, such as a watch-spring, placed on a table, and by varying the form of the spring and moving the source of light, a variety of patterns may be obtained.

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  • The simplest case of a caustic curve is when the reflecting surface is a circle, and the luminous rays emanate from a point on the circumference.

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  • 1 AQP be the reflecting circle Caustics having C as centre, P the luminous point, and PQ any incident ray, and we join CQ, it follows, by the law of the b efiection.

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  • The Cartesian equation to the caustic produced by reflection at a circle of rays diverging from any point was obtained by Joseph Louis Lagrange; it may be expressed in theform 1(4,2_ a2) (x 2+ y2) - 2a 2 cx - a 2 c 2 1 3 = 2 7 a4c2y2 (x2 + y2 - c2)2, where a is the radius of the reflecting circle, and c the distance of the luminous point from the centre of the circle.

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  • It is usually the case that the secondary caustic is easier to determine than the caustic, and hence, when determined, it affords a ready means for deducing, the primary caustic. It may be shown by geometrical considerations that the secondary caustic is a curve similar to the first positive pedal of the reflecting curve, of twice the linear dimensions, with respect to the luminous point.

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  • The simplest instance of a caustic by refraction (or diacaustic) is when luminous rays issuing from a point are refracted at a straight line.

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  • tive than the first, is an ellipse having the luminous point for a focus, and its centre at the foot of the perpendicular from the luminous point to the refracting line.

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  • There he spent the remainder of his life, a devoted husband, a wise and tender father, a careful householder, a virtuous villager, a friendly neighbour, and, spite of all his disclaimers, the central and luminous figure among the Transcendentalists.

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  • He was the first to use the vacuum tube with the capillary part now called a Geissler's tube, by means of which the luminous intensity of feeble electric discharges was raised sufficiently to allow of spectroscopic investigation.

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  • If a luminous body is surrounded by empty space, the light which it emits suffers no loss of energy as it travels outwards.

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  • Thus black substances such as charcoal are very luminous when heated.

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  • On the other hand, those substances which either are good reflectors or good transmitters, are not so luminous at the same temperature; for instance, melted silver, which reflects well, is not so luminous as carbon at the same temperature, and common salt, which is very transparent for most kinds of radiation, when poured in a fused condition out of a bright red-hot crucible, looks almost like water, showing only a faint red glow for a moment or two.

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  • It burns with a brightly luminous flame, and is spontaneously inflammable at about too° C. When mixed with oxygen it combines explosively if the mixture be under diminished pressure, and is violently decomposed by the halogens.

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  • It spontaneously inflames in air or oxygen; and when the gas is issuing from a jet into air the flame is greyish green, with a faintly luminous and yellow tip; the flame is probably one of the coldest known.

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  • The phosphorus used in the British pharma copoeia is obtained from calcium phosphate, and is a waxlike non-metallic substance soluble in oils and luminous in the dark.

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  • IjXtos, from which comes helio- in various English compounds), the name of the central body of the solar system, the luminous orb from which the earth receives light and heat; (see Sunshine); hence by analogy other heavenly bodies which form the centre of systems are called suns.

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  • The name has no reference to the appearance of the body to the eye; when emitting energy, its radiations will he of all wave-lengths, and if intense enough will appeal to the eye as luminous between about wave-lengths 7600 and 4000 tenth-metres; this intensity is a question of temperature, and as it is exquisitely inappropriate to speak of the bulk of the solar radiations as black, the writer will speak instead of amorphous radiations from an ideal radiator.

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  • It will be seen that the maximum ordinates lie upon the curve A9 = constant dotted in the figure, and so, as the temperature of the ideal body rises, the wave-length of most intense radiation shifts from the infra-red X towards the luminous part of the spectrum.

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  • It is a colourless liquid which boils at 11 -12° C., and its vapour burns with a luminous flame.

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  • Minium appeareth there of any colour indifferently, with which 'tis illustrated, but yet most luminous in red, and so Bise appeareth indifferently of any colour with which 'tis illustrated, but yet most luminous in blew.

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  • The Edinburgh Review of April 1903 contains a luminous essay; and Mr Bryce has a chapter on Acton in his Studies of Contemporary Biography (1903).

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  • George Grenville, whom the Rockinghams had displaced, and who was bitterly incensed at their formal reversal of his policy, printed a pamphlet to demonstrate his own wisdom and statesmanship. Burke replied in his Observations on a late Publication on the Present State of the Nation (1769), in which he showed for the first time that he had not only as much knowledge of commerce and finance, and as firm a hand, in dealing with figures as Grenville himself, but also a broad, general and luminous way of conceiving and treating politics, in which neither then nor since has he had any rival among English publicists.

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  • So a black whirl and torment of rapine, violence and fraud was encircling the Western world, as a life went out which, notwithstanding some eccentricities and some aberrations, had made great tides in human destiny very luminous.

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  • The work on [[Trigonometry]] and Double Algebra (1849) contains in the latter part a most luminous and philosophical view of existing and possible systems of symbolic calculus.

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  • Prior to 1691, however, Dr John Clayton, dean of Kildare, filled bladders with inflammable gas obtained by the distillation of coal, and showed that on pricking the bladders and applying a light to the escaping gas it burnt with a luminous flame, and in 1726 Stephen Hales published the fact that by the distillation of 158 grains of Newcastle coal, 180 cub.

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  • rendered luminous by passing it through chambers in which oils are decomposed by heat, the mixture being made so as to give an illuminating value of 22 to 25 candles.

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  • Both rock-salt and carbon bisulphide are extremely transparent to the luminous and also to the infra-red rays The iodine in the solution, however, has the property of absorbing the luminous rays, while transmitting the infra-red rays copiously, so that in sufficient thicknesses the solution appears nearly black.

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  • Since the rays used by Tyndall in these experiments are similar to those emitted by a heated body which is not hot enough to be luminous, it might be thought that the radiation, say from a hot kettle, could be concentrated to a focus and employed to render a small body luminous.

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  • Tyndall used the dark rays from a luminous source, which are emitted in a highly concentrated form, so that it was possible to obtain a high temperature, which was, however, much lower than that of the source.

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  • So Euripides describes the inhabitants as "ever walking gracefully through the most luminous ether" (Med.

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  • The changes which the aspect of the heaven undergoes, as we travel North and South, are so well known that they need not be described in detail here; but a general statement of them will give a luminous idea of the geometrical co-ordinates we have described.

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  • A luminous idea of the nature of these two classes of variation may be gained by conceiving of the, motion of a ship, floating on an ocean affected by a long ground swell.

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  • That is to say, they stop out just those sections of white light transmitted through them which form their own special luminous badges.

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  • That of the 8th of July 1842 was the first to be efficiently observed; and the luminous inducements to the construction of exact and comprehensive catalogues has been to elicit, by comparisons of those for widely separated epochs, the proper motions of the stars enumerated in them.

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  • A luminous idea of the geometrical relations of the moon, earth and sun will be gained from the figure, by imagining the sun to be moved towards the left, and placed at a distance of 20 ft.

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  • Thus light, pressure, or mechanical stimulation acting on the retina and optic nerve invariably produces luminous impressions.

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  • Indeed no man ever concentrated authority to such a point, nor showed mental abilities at all comparable to his: an extraordinary power of work, prodigious memory for details and fine judgment in their selection; together with a luminous decision and a simple and rapid conception, all placed at the disposal of a sovereign will.

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  • In Egyptian mythology the serpent Apap with an army of monsters strives daily to arrest the course of the boat of the luminous gods.

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  • The use of such furnaces has very considerably diminished, owing to the general introduction of coal-gas for heating purposes in laboratories, which has been rendered possible by the invention of the Bunsen burner, in which the mixture of air and gas giving the least luminous but most powerfully heating flame is effected automatically by the effluent gas.

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  • The moon was a luminous, bright globe in the dark sky, radiant with silver light.

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  • This chaotic motion may be caused by the powerful ultraviolet radiation from the luminous, massive stars.

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  • The luminous trail led toward a large sarcophagus, dominating the oldest part of the graveyard.

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  • A luminous goo in the middle of two shortcake biscuits, who could want more?

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  • His particularly luminous eyes glare fiercely under a black slouched hat.

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  • The outside looks a bit odd - luminous snot green is the best description - we expected to see a few hobbits inside.

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  • Color and aspect: clear, luminous, crystalline pale gold spangled with flashes of green sparkle and amber glitter.

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  • The fluorescents stuttered into life, painting a luminous topcoat of normality on the silent kitchen.

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  • A long, luminous sunbeam fell across the landing, touching the edge of her hair till it glimmered like bronze afire.

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  • The brightest known stars in our galaxy are very luminous red supergiants.

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  • A 10 solar mass star might be over 10000 times as luminous and shine as a supergiant star.

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  • I pulled my oxygen mask down and said: But I 've got luminous testicles !

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  • The subsidiary seconds are at 9. It still has bright tritium luminous dial markings.

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  • The luminous dial illumination for night navigation uses Tritium gas.

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  • A person who is lit from within, reflecting the natural worlds ' own luminous, infinite wisdom.

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  • An electric fly zapper, insurance rated fire extinguishers and fire blanket together with luminous signs and First Aid stations.

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  • It's always a good idea to include a small card with the gift specifying the care that might be needed to keep the silver looking luminous and sparkling.

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  • The soft hair, luminous eyes and sweet faces charm many who see them.

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  • Luminous metallic themes are a hot trend in architecture, interior design, and fashion.

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  • It is probably the most eclectic of the Martha Stewart furniture collections, combining luminous metal finishes, glossy lacquers, special veneers, Art Deco and Asian themes, mother-of-pearl and painted glass accents.

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  • The early 90s were characterized by matte lips and faces, whereas the new millennium brought in a bloom of luminous cheeks and shimmering lips.

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  • Traceless: If you prefer an extremely lightweight finish, you'll love the natural, luminous glow Traceless imparts.

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  • Illuminating Potion: Use this as a primer for foundation - its pigment-infused formula will leave skin luminous.

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  • Achieving flawless, luminous skin without breaking the bank might just be possible with a little help from bargain mineral makeup brands.

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  • Blushes with a bit of sparkle can help create a soft and luminous look.

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  • Instead of a dull matte texture, choose a luminous lipcolor that appears kissable.

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  • Emo eye makeup makes eyes look large and luminous.

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  • Moonstone's mystical lore and luminous beauty make it a natural choice for symbolic jewelry.

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  • The majority of these styles are bold in their design and many feature frames in unusual colors, such as eye catching reds and heavenly luminous golds.

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  • Synthetic hair does have its advantages in that it holds a permanent style and features a luminous shine.

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  • More recently, rocker and fashion designer Gwen Stefani recorded a television spot for L'Oreal, citing this hair color as her go to product for luminous hair.

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  • Their variety of products give a luminous glow to your skin, and the prices are reasonable for what you get.

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  • A luminous floral pattern looks and feels so fresh during summer, especially when paired with a pair of elongating beige sandals.

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  • Therefore, it is no surprise that Chanel merchandise is manufactured using top of the line calfskins, metallic python, luminous silks, shimmering satins, and the softest goatskin on the market.

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  • Gals who like to shine will love the luminous look of a lurex Coach wristlet.

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  • It includes a stainless steel case with a luminous white dial with attractive black Roman numerals.

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  • With a stainless steel case, luminous white dial with attractive black Roman numerals, and water resistence up to 30 meters, it's sure to attrack many wandering eyes.

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  • The luminous hands and hour markers add to its stylish look.

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  • It has a stainless steel case and bracelet, a black dial, automatic movements, a 35mm casing, date calendar and luminous hands and markers.

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  • Its exterior features include luminous silver dial with a blue resin band with blue ring on its silver face.

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  • Apart from this its chronograph Movement, Time/Date Adjustment & Winding, Sapphire Crystal, Luminous Hands & Hour markers with Water resistant to 50m adds to its function making it desirable for every occasion.

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  • This Tag Heuer Link series men's watch is galvanized with a sparkling diamond hour maker and a luminous dot besides each diamond, this sets on an appealing stainless steel case with polished rotating bezel.

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  • This time piece reflects innovation with Numerals Luminous Hands and Hour Markers.

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  • This feminine tag heuer Link Ladies watch genuinely glitters with Pretty Mother of Pearl White dial and luminous hands, galvanized with sunray-effect for the central zone, and spiral decorated for the external zone.

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  • Raised, stationary brushed steel bezel frames the dark brown dial with luminous hands and baton hour markers.

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  • Other interesting features include Numerals Luminous Hands and Hour Markers with Date Displays at 6 O'clock.

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  • This men's watch comes in square case, Blue dial with 2 silver sub-dials and luminous hands and hour markers, Dark Blue crocodile leather strap with Folding buckle in polished steel with push buttons.

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  • Black dial with 3 sub-dials and luminous hands and hour markers, covered with sexy Black crocodile leather strap with Folding buckle in polished steel with push-buttons.

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  • This Tag Heuer Monza men's watch is adorned with an artistic case approximately 38mm and 13mm thick with accentuate Black dial and luminous hands and markers.

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  • The luminous white dial, date window between 4 & 5 o'clock and the Brown Leather strap with Automatic Chronograph movement combines function with fashion.

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  • Apart from this its chronograph Movement, Time/Date Adjustment & Winding, Sapphire Crystal, Luminous Hands & Hour markers with Water resistant to 50m adds to its function making it desirable for every occasion.

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  • Engineered with care, the watch comes in Rose Gold case, luminous white Sapphire (Scratch Resistant) dial, a Date window at 3, Rose Gold bezel to match the dial, a Cabochon crown and folding clasp fitted to a black leather bracelet.

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  • The luminous white dial, date window between 4 & 5 o'clock and the Brown Leather strap with Automatic Chronograph movement combines function with fashion.

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  • They also feature a polished stainless steel face with convex beveled grids, luminous hands and markers, a Cabochon crown, unidirectional bezel and a calendar.

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  • Luminous hands and a sweep second hand sit atop the Roman numeral markers.

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  • Lumbrite, or lumibrite, is a luminous material that is used to make the dials of many Seiko watches.

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  • Lumbrite is a newer material that lasts longer and is brighter than the luminous materials previously used in watchmaking.

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  • The large round face and luminous dial is a distinctive part of the design and one of the important features.

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  • The Gemini features an automatic chronograph, domed anti-reflective sapphire crystal and luminous hands and markers.

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  • The case is 48 mm in diameter with luminous hands and markers indicating the hour.

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  • At the time, radioactive radium was the main substance used to create the luminous paint.

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  • Additional features include a brown alligator strap, sapphire glass crystal, automatic chronograph movement, and luminous figures and hands.

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  • Sports features include a safety clasp, water resistance to 200 meters, mineral crystal, calendar options, and luminous dial.

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  • Add a rotating bezel and a black dial with luminous markers into the mix and even the most discriminating watch enthusiast can't resist.

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  • The stainless steel case shows off a vivid blue dial and luminous markers while the synthetic leather brown strap maintains a casual yet sophisticated look.

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  • Sports features include water resistance to 99 feet, luminous markers over a fashionable green dial, a shatter-proof mineral crystal and a range of calendar options.

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  • Technical diving features include a rotating bezel for elapsed time tracking, self-winding automatic movement, luminous hands and markers for murky diving situations and a hardflex crystal.

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  • To satisfy the vanity in everyone, Seiko proudly imbued this model with a sense of fashion by giving it a deep black watch face and luminous hands.

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  • Luminous markers and numerals complete the look of elegance.

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  • In addition to water resistance to 3300 feet, you'll appreciate tech features like a screw-down crown and case back, unidirectional rotating bezel, luminous hands and markers and a clear mineral crystal.

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  • Luminous hands and 18 karat gold plating complete the picture of sporty chic.

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  • The stainless steel body panels of the car gave it a luminous and eye-catching appearance.

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  • Pierre Bideau, an electrician and engineer, designed the lights that originally adorned the tower to give it that characteristic, luminous glow.

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  • Silver threads and tinsel are sewn into the chandelle feathers for luminous beauty.

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  • Freshly scrubbed skin is the key to a luminous, radiant glow because it exposes a healthy layer of skin.

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  • One of the most common and effective AHAs is glycolic acid, which contributes to collagen production and essentially plumps the cells from within, resulting in a more luminous, radiant complexion.

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  • Luminous: Ideal for very light or fair skin, this neutral color leaves behind a natural finish.

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