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Achromatic   Listen
Achromatic  adj.  
(Opt.) Free from color; transmitting light without decomposing it into its primary colors.
(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

... 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 ...
— Side-lights on Astronomy and Kindred Fields of Popular Science • Simon Newcomb

... laboratory, the apparatus owned and used by Priestley, which at present constitutes and for many years past has formed an attractive collection in Dickinson College, (Pa.) There would be the burning lens, the reflecting telescope, the refracting telescope (probably one of the first achromatic telescopes made), the air-gun, the orrery, and flasks with heavy ground necks, and heavy curved tubes with ground stoppers—all brought (to Dickinson) through the instrumentality of Thomas Cooper, "the greatest man ...
— Priestley in America - 1794-1804 • Edgar F. Smith

... imagination. Dr. Klein has frequently seen this rill with great distinctness, and at other times sought for it in vain; though on each occasion the conditions of illumination, libration, and definition were practically similar. I have sometimes found this cleft an easy object with a 4 inch achromatic. Again, many rills described by Madler as very delicate and difficult to trace, may now be easily followed in "common telescopes." In short, the more direct telescopic observations accumulate, and the more the study ...
— The Moon - A Full Description and Map of its Principal Physical Features • Thomas Gwyn Elger

Words linked to "Achromatic" :   grayish-black, achromatic colour, cool-white, silvery-grey, pearl grey, pearly, red-gray, neutral, ashy, silvery-gray, colorless, milk-white, brownish-gray, olive-grey, charcoal-gray, snowy, silverish, reddish-grey, sable, bluish-white, blackish-gray, stone-grey, bluish-grey, jet, greyish-black, pitchy, purplish-black, silver-gray, achromatize, brownish-grey, black-gray, slate-black, purple-black, coal-black, gray-white, bluish-gray, off-white, silver, iron-grey, violet-black, sooty, snow-white, blue-grey, hueless, charcoal-grey, chalky, gray, pinkish-white, slaty-gray, brownish-black, slaty-grey, achromatic vision, brown-gray, chromaticity, achromatic color, pearl gray, yellowish-white, silver-grey, gray-black, blackish-grey, oxford-gray, yellow-grey, grayish, hue, ebony, brown-grey, grey-black, canescent, inky, olive-gray, greenish-white, blue-gray, greenish-gray, achromatic lens, ink-black, ebon, argent, grey-white, yellow-white

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