Magnifying glasses are often used for viewing three-dimensional objects.
This angle, therefore, divided by the magnifying power of the telescope gives the real angular distance of the centres of a double star.
Focal length, with a magnifying power of 38 diameters, which he presented to the Royal Society of London in December 1671.
Focal length, having eye-pieces magnifying up to 230 diameters.
Of the magnifying power of telescopes, for the rays emerging from the eye-piece when adjusted for distinct vision to be parallel.
The magnifying power of the telescope is = Ff /ex, where F and f are respectively the focal lengths of the large and the small mirror, e the focal length of the eye-piece, and x the distance between the principal foci of the two mirrors (=Ff in the diagram) when the instrument is in adjustment for viewing distant objects.
The magnifying power is computed by the same formula as in the case of the Gregorian telescope.
Another form of the word, "Egotism," is really interchangeable, though in ordinary language it is often used specially (and similarly "egoism," as in George Meredith's Egoist) to describe the habit of magnifying one's self and one's achievements, or regarding all things from a selfish point of view.
The sharpness of image in Kepler's telescope is very inferior to that of the Galilean instrument, so that when a high magnifying power is required it becomes essential to increase the focal length.
Also the diameter of the pencil or parallel rays emerging from the eye-lens to the diameter of the object-lens inversely as, the magnifying power of the telescope.
The system consequently acts as a continuous lens, magnifying the object in a vertical direction.
When the details are no longer recognizable by the unaided eye, the magnifying glass or the simple microscope is necessary.
It has mainly to be considered in connexion with powerful magnifying glasses.
In magnifying glasses for direct vision the eye must always be considered.
With low magnifying systems and a large free object distance, ordinary good daylight is sufficient.
In this way the scale can be viewed by a microscope of much higher magnifying power than can be employed for the photographed spectrum.
Allowance should be made for the habit of exaggeration among the Spanish adventurers of that time, and also for the diplomacy of Cortes in magnifying his exploits to win the' favour of his king.
His aim was really to make the ecclesiastical courts independent of the law by speciously magnifying the royal authority over them.
The magnifying power obviously depends on the proportion of the focal length of the object-lens to that of the eye-lens, that is, magnifying power where F is the focal length of the object-lens and e that of the eye-lens.
The magnifying power is = Fle.
The sand, which is nominally the filter, has interstices about thirty times as wide as the largest dimensions of the larger microbes; and the reason why these, and, still more, why organisms which were individually invisible under any magnifying power, and could only be detected as colonies, were arrested, was not understood.
A, slip as received on recorder, using ordinary relays for translating on to second cable; B, slip as received on recorder, when interpolator is used at intermediate station, for sending on to second cable; C (four cells through a line, KR=3.6), signals with recorder under ordinary conditions; D, all conditions the same as in C, but magnifying relay inserted between the end of the line and the recorder.
Hence a wide beam demands treatment with further apparatus (usually a telescope) of high magnifying power.
In observing the bands he received them at first upon a screen of finely ground glass, upon which a magnifying lens was focused; but it soon appeared that the ground glass could be dispensed with, the diffraction pattern being viewed in the same way as the image formed by the object-glass of a telescope is viewed through the eye-piece.
If we hold a common reading lens (a magnifying lens) in front of a lamp or some other bright object and at some distance from it, and if we hold a sheet of paper vertically at a suitable distance behind the lens, we see depicted on the paper an image of the lamp. This image is inverted and perverted.
He was well acquainted with the use of magnifying glasses and suggested a kind of telescope for viewing the moon, but does not seem to have thought of applying a lens to the camera.
In experiments with magnifying glasses, and through spars, the ordinary effects of magnifying and of alteration of view are sometimes produced; sometimes they are not.
The word is also used as a unit of linear measurement of the magnifying power of a lens or microscope.
This he mentions " because the glasses in these two sorts are somewhat prismatical, a but mostly those of the first model, which could therefore bear no great charge (magnifying power)."
(d) The scales are made of iridio-platinum instead of silver, and the magnifying power of the reading microscope is increased fourfold (viz.
13" or 14" when the magnifying power is loo, and varying inversely as the power.
But his pretensions were ludicrous; he was quickly captured by the Chileans and sent back to France (1862) as a madman; and though he made one more abortive effort in 1874 to recover his "kingdom," and occupied his pen in magnifying his achievements, nobody took him seriously except a few of the deluded Indians.
Hence one of the best methods of determining the magnifying power of a telescope to measure the diameter of the emergent pencil of rays, after the FIG.
A rumour of the new invention, which reached Venice in June 1609, sufficed to set Galileo on the track; and after one night's profound meditation on the principles of refraction, he succeeded in producing a telescope of threefold magnifying power.
There is reason to believe that the magnifying power of transparent media with convex surfaces was very early known.
A normal eye will therefore see an image formed by the magnifying glass most conveniently when it is produced at a great distance, i.e.
Away; and observation through the magnifying glass must be undertaken by the normal eye with passive accommodation.
If the ordinary convex lens be employed as magnifying glass, great aberrations occur even in medium magnifications.
This lens is employed in articles found in tourist resorts as a magnifying glass for miniature photographs of the locality.
By introducing a dispersive lens of flint the magnifying glass could be corrected for both chromatic and spherical aberrations.
The magnifying power is varied by changing the lens a for another in which p has a different value.
He then altered the magnifying power by sliding the field lens of the eye-piece (which was fitted with a slipping tube for the purpose) along the eye-tube, till the images were brought into contact.
By a scale attached to the sliding tube the magnifying power of the eye-piece was deduced, and this combined with the angle of the prism employed gave the angle measured.
Formerly, writers accounted for the Lutheran movement by so magnifying the horrors of the pre-existing regime ity of the that it appeared intolerable, and its abolition consequently inevitable.
Less conspicuous periscopes were therefore designed, and these, in order to take in enough of the foreground, had to be provided with a magnifying as well as a reflecting system.
L/y = i/f = V.1; (2) it is thus equal to the magnifying power multiplied by the distance of distinct vision, or the number of times that the focal length is contained in Io in.
The magnifying power of the eye-piece is that of a single lens of focus = Jp.
If p" is the refracting angle of the prism, and n the magnifying power of the eye-piece, then p"ln will be the distance observed.
I) tan w = y/l, where l = i o in., whilst the apparent size of the object viewed through the magnifying glass would result from the formula (I) tan w' = y/f.
Supposing, however, there is oblique illumination, then formula (5) can always be applied to determine the magnifying power attainable with at least one objective.
By substituting y, the size of the object, for d, the smallest value which a single object can have in order to be analysed, and the angle w' by 2', we obtain the magnifying power and the magnification number: V2 = tan w'Id= 2A tan 2'/X; N2 = 2Al tan 2'/A; where 1 equals the sight range of io in.
The magnification and magnifying number which are most necessary for a microscope with an objective of a given aperture can then be calculated from the formulae: V4 = 2A tan 4'/X; N4 = 2Al tan 4'/A.
A volume entitled Opera posthuma (Leiden, 1703) contained his "Dioptrica," in which the ratio between the respective focal lengths of object-glass and eye-glass is given as the measure of magnifying power, together with the shorter essays De vitris figurandis, De corona et parheliis, &c. An early tract De ratiociniis tin ludo aleae, printed in 16J7 with Schooten's Exercitationes mathematicae, is notable as one of the first formal treatises on the theory of probabilities; nor should his investigations of the properties of the cissoid, logarithmic and catenary curves be left unnoticed.