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Achromatic   Listen
adjective
Achromatic  adj.  
1.
(Opt.) Free from color; transmitting light without decomposing it into its primary colors.
2.
(Biol.) Uncolored; not absorbing color from a fluid; said of tissue.
Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed.
Achromatic prism. See Prism.
Achromatic telescope, or Achromatic microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.






Collaborative International Dictionary of English 0.48








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"Achromatic" Quotes from Famous Books



... altogether,—leave the whole group of sun, primary and secondary planets quite behind us in our flight, as a bird might leave its bush and sweep into the whole forest. Now what do you see, Lady Constantine?' He levelled the achromatic at Sirius. ...
— Two on a Tower • Thomas Hardy

... how these difficulties can be, to a great extent, overcome, by employing for the objective a composite lens made of two pieces of glass possessing different qualities. To these achromatic object glasses, as they are called, the great development of astronomical knowledge, since Newton's time, is due. But it must be remarked that, although the theoretical possibility of constructing an achromatic lens was investigated by Newton, he certainly came to the conclusion that the difficulty ...
— Great Astronomers • R. S. Ball

... the other, and fashioning flank and limb into due salamandrine proportions, in so artistic a way, that, after watching the process hour by hour, one is almost involuntarily possessed by the notion, that some more subtle aid to vision than an achromatic, would show the hidden artist, with his plan before him, striving with skilful ...
— Lectures and Essays • T.H. Huxley

... the Virtues! We can spare you now. A little clear perfection, undiluted with human weakness, goes a great way. Go! be useful, be honorable and honored, be just, be charitable, talk pure reason, and help to disenchant the world by the light of an achromatic understanding. Goodbye! Where is my Beranger? I must read a verse or ...
— The Autocrat of the Breakfast-Table • Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)

... plain-song was dissolved into descant, and how easily they came off with the last rest. Hark, hark, the bitter'st[268] sweetest achromatic. ...
— A Select Collection of Old English Plays, Vol. IX • Various

... APPARATUS for 4l. 4s., containing an Expanding Camera, with warranted Double Achromatic Adjusting Lenses, a Portable Stand, Pressure Frame, Levelling Stand, and ...
— Notes and Queries, Number 218, December 31, 1853 • Various

... Lens.—The generality of purchasers of photographic lenses can content themselves with merely the following rules when they buy. It ought to be achromatic, i. e. consisting of the usual two pieces of crown and flint glass, that its curves are the most recommended, and that it is free from bubbles: to ascertain the latter, hold the lens between the finger and thumb of the right hand, much as an egg-merchant examines an egg before a strong ...
— Notes and Queries, Number 188, June 4, 1853 • Various

... eudiometers, thermometric scales, philosophical instruments, were distributed through the chambers. The third story, save two bed-chambers,—one for the housekeeper, the other for the footman,—had been fitted up for an observatory. The lenses and achromatic glasses, tubes and specula, concave mirrors, and object-prisms, and the huge, rough old telescope, peering through the roof, were still there as their owner had left them. All appliances of housekeeping were absent, and ...
— Prairie Farmer, Vol. 56: No. 3, January 19, 1884. - A Weekly Journal for the Farm, Orchard and Fireside • Various

... younger Herschel, in conjunction with Sir James South, undertook a series of observations on the distances and positions of three hundred and eighty double and triple stars, by means of two splendid achromatic telescopes of five and seven focal length. These were continued during 1822 and 1823, and have proved ...
— The Story of the Herschels • Anonymous

... head came through slowly with a surprised expression upon his face. He remembered. He remembered the thing as a bald discovery, and without a touch of emotion. With all the achromatic clearness, the unromantic colourlessness of ...
— Love and Mr. Lewisham • H. G. Wells

... a very excellent achromatic spy-glass of 2 inches diameter. The object-glass was made by the celebrated Ramsden. When I was about fifteen I used it to gaze at the moon, planets, and sun-spots. Although this instrument revealed to me the general characteristic details ...
— James Nasmyth's Autobiography • James Nasmyth

... frizzling down the Red Sea, I noted on deck almost at once an odd-looking young man of twenty-two or thereabouts, with a curious faint pea-green complexion. He was the wishy-washiest young man I ever beheld in my life; an achromatic study: in spite of the delicate pea-greeniness of his skin, all the colouring matter of the body seemed somehow to have faded out of him. Perhaps he had been bleached. As he leant over the taffrail, gazing down with open mouth and vacant stare at the water, I took a good long look at ...
— Miss Cayley's Adventures • Grant Allen

... The achromatic object-glass, invented by Dollond, about 1750, obviates this difficulty, and brings all the rays to nearly the same focus. Nearly every one interested in the subject is aware that this object-glass is composed of two lenses—a concave one of flint-glass and a ...
— Side-lights on Astronomy and Kindred Fields of Popular Science • Simon Newcomb

... Society, written, if we remember right, after the age of eighty, with delight and admiration. Those little lenses in their silver mountings, all ground and set and fashioned by his own hand, showed him the blood-globules, and the "pipes" of the teeth, which Purkinje and Retzius found with their achromatic microscopes a century later. We honor his skill and sagacity as they deserve; but a little trick of Mr. Dollond's, applied to the microscopic object-glass, has left all his achievements a mere matter of ...
— The Atlantic Monthly, Vol. I., No. 3, January 1858 - A Magazine of Literature, Art, and Politics • Various

... ACHROMATIC. An optical term applied to those telescopes in which aberration of the rays of light, and the colours dependent thereon, are partially ...
— The Sailor's Word-Book • William Henry Smyth

... which can enter the pupil. It should, however, be added that the composite nature of light requires a more complex form of object-glass than the simple lens here shown. In a refracting telescope we have to employ what is known as the achromatic combination, consisting of one lens of flint glass and one of crown glass, adjusted to suit each other with ...
— The Story of the Heavens • Robert Stawell Ball

... If I were to attempt to do justice to the merits of this great society, I should have to devote many pages, to such subjects as the achromatic telescope of Dollond; the dividing engine of Ramsden, which first gave precision to astronomical observations, the measurement of a degree on the earth's surface by Mason and Dixon; the expeditions of Cook in ...
— History of the Conflict Between Religion and Science • John William Draper

... Dollond subsequently proved that by combining two different kinds of glass, the colours can be extinguished, still leaving a residue of refraction, and he employed this residue in the construction of achromatic lenses—lenses yielding no colour—which Newton thought an impossibility. By setting a water-prism—water contained in a wedge-shaped vessel with glass sides (B, fig. 8)—in opposition to a wedge of glass (to the right of B), this point can be illustrated before you. We have ...
— Six Lectures on Light - Delivered In The United States In 1872-1873 • John Tyndall



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