The Measurement of Areas is easily effected if the map at our disposal is drawn on an equal area projection.
Measurement On Maps Measurement of Distance.
The Greeks created the sciences of geometry and of number as applied to the measurement of continuous quantities.
One important measurement is that of the wave-length emitted from an antenna.
If love alone was a measurement of success, the future of the three had a small measure hope.
The celebrated Newland oak in Gloucestershire, known for centuries as "the great oak," was by the latest measurement 472 ft.
For the measurement of wider stars he invented his lamp-micrometer, in which the components of a double star observed with the right eye were made to coincide with two lucid points placed io ft.
They are ascertained by a ticalgeo- combination of actual measurement of the highest.
Thus the whole method of measurement in geometry as described in the elementary textbooks and the older treatises is obscure to the last degree.
Still, the idea of the exact measurement of sensation has been a fruitful one, and mainly through his influence on Wundt, Fechner was the father of that "new" psychology of laboratories which investigates human faculties with the aid of exact scientific apparatus.
Arago, with whom he had already carried out investigations on the refractive properties of different gases, in the measurement of an arc of the meridian in Spain, and in subsequent years he was engaged in various other geodetic determinations.
Quick motion in position-angle for rough setting or for the measurement of close double stars is given by the large ring R.
The measurement of a coast-line is difficult, because the length will necessarily be greater when measured on a largescale map where minute irregularities can be taken into account.
The above-described gravity type can be employed with certain restrictions for the measurement of alternating currents.
Complex spectra of stars of the solar type this is by no means the case; for, as Dr Hartmann remarks, " in the first place the lines in these spectra are so numerous that their complete measurement and reduction would require many days, and in the second place a rigorous reduction of such material has hitherto not been at all possible because the wave-lengths of the lines are not known with sufficient accuracy.
The alteration in the direction of the bounding line, due to alteration in the unit of measurement of Y, is useful in relation to geometrical projection.
21 a contours are based upon instrumental measurement, and as a whole these ordnance maps were undoubtedly superior in accuracy, with rare exceptions, to similar maps published by foreign governments.
The same book contains an account of Norman's discovery and correct measurement of the dip (1576).
Before astronomical telescopes were mounted parallactically, the measurement of position angles was seldom attempted.
For purposes of measurement the polar boundaries are taken to be the Arctic and Antarctic circles, although in discussing the configuration and circulation it is impossible to adhere strictly to these limits.
Now frequency of movement, average daily price variation, and range of price movements are matters of fundamental importance to the public. Hence for practical purposes we require several kinds of measurement of price movements, and it is impossible to weigh exactly the one against the other in respect of importance.
AMPEREMETER, or Ammeter, an instrument for the measurement of electric currents in terms of the unit called the ampere.
Soc. Arts, 1901, and " Measurement of High Frequency Currents," Cantor Lectures, ib., 1905; G.
In height it stood about the same as a young individual of the ordinary African elephant when about a year and a half old, the vertical measurement at the shoulder being only 4 ft., or merely a foot higher than a new-born Indian elephant.
The operations were carried on during eight years on a plain to the south of Quito; and, in addition to his memoir on this memorable measurement, La Condamine collected much valuable geographical information during a voyage down the Amazon.
In constructing a hot-wire instrument for the measurement of high frequency currents it is necessary to make the working wire of a number of fine wires placed in parallel and slightly separated from one another, and to rpass the whole of the current to be measured through this strand.
Direct reading equidivisional movable coil ammeters can be made in various portable forms, and are very much employed as laboratory instruments and also as ammeters for the measurement of large electric currents in electric generating stations.
In the case of substances possessing anomalous dispersion, the direct measurement of the refractive index for Hertzian waves of very long wave-length may be employed.
Now, owing to the necessary inexactness of measurement, it is impossible to discriminate directly whether any kind of continuous physical quantity possesses the compactness of the series of rationals or the continuity of the series of real numbers.
For accurate measurement of the displacements of lines of stellar spectra which are produced by the relative motion of star and observer in the line of sight, a very beautiful instrument has been devised by Dr J.
Hamilton, "the measurement of a number of tails of the [European] wild cat and of the domestic cat gives a range between 11 in.
At the beginning of 1680 he presented a paper to the Royal Society, De nova temporis dimetiendi ratione et accurata horologiorum .constructione, in which he attempted to deprive Huygens of the honour of applying the pendulum to the measurement of time.
The great geographical event of the century, as regards that continent, was the measurement of an arc of the So meridian.
When the first system then is transformed into the second, the excess of energy which the former possesses must appear in the shape of heat, light, electrical energy, mechanical energy, &c. It is for the most part a simple matter to obtain the excess of energy entirely in the form of heat, the amount of which is easily susceptible of measurement, and thus the existence of thermochemistry as a practical science is rendered possible.
In certain forms, hot-wire instruments are well adapted for the measurement of very small alternating currents.
Would be equal to 114,800 metres, its actual length according to modern measurement being I Io,808 metres.
In fact, the whole theory of measurement in geometry arises at a comparatively late stage as the result of a variety of complicated considerations.
The heading "Measurement of Dynamical Quantities" includes the topics units, measurements, and the constant of gravitation.
The moment of a magnet may also be deduced from a measurement of the couple exerted on the magnet by a uniform field H.
The joint was surrounded by an induction coil connected with a ballistic galvanometer, an arrangement which enabled him to make an independent measurement of the induction at the moment when the two portions of the bar were separated.
Several instruments in which the traction method is applied have been devised for the rapid measurement of induction or of magnetization in commercial samples of iron and steel.
For the practical measurement of field intensity du Bois has used plates of the densest Jena flint glass.
The harmony between arithmetical and geometrical measurement, which was disturbed by the Greek geometers on the discovery of irrational numbers, is restored by an unlimited supply of the causes of disturbance.
From a measurement of the maximum distance the least angle between consecutive lines consistent with resolution may be deduced, and a comparison made with the rule stated above.
Should any one be sceptical as to the sufficiency of these laws to account for the present state of things, science can furnish no evidence strong enough to overthrow his doubts until the sun shall be found growing smaller by actual measurement, or the nebulae be actually seen to condense into stars and systems."
The arid nature of the trans-Caspian deserts has proved an insuperable obstacle to those rigorous methods of geodetic survey which distinguish Russian methods in Europe, so that Russian geography in central Asia is dependent on other means than that of direct measurement for the co-ordinate values in latitude and longitude for any given point.
Its length (outside measurement) is 464 ft., its breadth 159 ft.; the nave is 136 ft.
But while we have yet to wait for that expansion of principal triangulation which will bring Asia into connexion with Europe by the direct process of earth measurement, a topobetween graphical connexion has been effected between Russian Russ/an and Indian surveys which sufficiently proves that the and deductive methods employed by both countries for the Indian determination of the co-ordinate values of fixed points so surveys.
They are constructed for the measurement not only of continuousor unvarying butalsoof alternating currents.
Measurement of Field Strength.