| slovo | definícia |
achromatic
(encz) | achromatic,achromatický Josef Kosek |
achromatic
(encz) | achromatic,bezbarvý Josef Kosek |
Achromatic
(gcide) | Achromatic \Ach`ro*mat"ic\, a. [Gr. 'achrw`matos colorless; 'a
priv. + chrw^ma, chrw`matos, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
decomposing it into its primary colors.
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2. (Biol.) Uncolored; not absorbing color from a fluid; --
said of tissue.
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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 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.
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achromatic
(wn) | achromatic
adj 1: having no hue; "neutral colors like black or white" [syn:
achromatic, neutral] [ant: chromatic] |
| | podobné slovo | definícia |
achromatický
(czen) | achromatický,achromatic Josef Kosek |
Achromatic
(gcide) | Achromatic \Ach`ro*mat"ic\, a. [Gr. 'achrw`matos colorless; 'a
priv. + chrw^ma, chrw`matos, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
decomposing it into its primary colors.
[1913 Webster]
2. (Biol.) Uncolored; not absorbing color from a fluid; --
said of tissue.
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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 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.
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Achromatic condenser
(gcide) | Condenser \Con*dens"er\, n.
1. One who, or that which, condenses.
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2. (Physic)
(a) An instrument for condensing air or other elastic
fluids, consisting of a cylinder having a movable
piston to force the air into a receiver, and a valve
to prevent its escape.
(b) An instrument for concentrating electricity by the
effect of induction between conducting plates
separated by a nonconducting plate.
(c) A lens or mirror, usually of short focal distance,
used to concentrate light upon an object.
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3. (Chem.) An apparatus for receiving and condensing the
volatile products of distillation to a liquid or solid
form, by cooling.
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4. (Steam Engine) An apparatus, separate from the cylinder,
in which the exhaust steam is condensed by the action of
cold water or air. See Illust. of Steam engine.
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Achromatic condenser (Optics), an achromatic lens used as a
condenser.
Bull's-eye condenser, or Bull's-eye (Optics), a lens of
short focal distance used for concentrating rays of light.
Injection condenser, a vessel in which steam is condensed
by the direct contact of water.
Surface condenser, an apparatus for condensing steam,
especially the exhaust of a steam engine, by bringing it
into contact with metallic surface cooled by water or air.
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Achromatic lens
(gcide) | Achromatic \Ach`ro*mat"ic\, a. [Gr. 'achrw`matos colorless; 'a
priv. + chrw^ma, chrw`matos, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
decomposing it into its primary colors.
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2. (Biol.) Uncolored; not absorbing color from a fluid; --
said of tissue.
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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 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.
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Achromatic prism
(gcide) | Prism \Prism\ (pr[i^]z'm), n. [L. prisma, Gr. pri`sma, fr.
pri`zein, pri`ein, to saw: cf. F. prisme.]
1. (Geom.) A solid whose bases or ends are any similar,
equal, and parallel plane figures, and whose sides are
parallelograms.
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Note: Prisms of different forms are often named from the
figure of their bases; as, a triangular prism, a
quadrangular prism, a rhombic prism, etc.
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2. (Opt.) A transparent body, with usually three rectangular
plane faces or sides, and two equal and parallel
triangular ends or bases; -- used in experiments on
refraction, dispersion, etc.
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3. (Crystallog.) A form the planes of which are parallel to
the vertical axis. See Form, n., 13.
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Achromatic prism (Opt.), a prism composed usually of two
prisms of different transparent substances which have
unequal dispersive powers, as two different kinds of
glass, especially flint glass and crown glass, the
difference of dispersive power being compensated by giving
them different refracting angles, so that, when placed
together so as to have opposite relative positions, a ray
of light passed through them is refracted or bent into a
new position, but is free from color.
Nicol's prism, Nicol prism. [So called from Wm. Nicol, of
Edinburgh, who first proposed it.] (Opt.) An instrument
for experiments in polarization, consisting of a rhomb of
Iceland spar, which has been bisected obliquely at a
certain angle, and the two parts again joined with
transparent cement, so that the ordinary image produced by
double refraction is thrown out of the field by total
reflection from the internal cemented surface, and the
extraordinary, or polarized, image alone is transmitted.
[1913 Webster] PrismaticAchromatic \Ach`ro*mat"ic\, a. [Gr. 'achrw`matos colorless; 'a
priv. + chrw^ma, chrw`matos, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
decomposing it into its primary colors.
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2. (Biol.) Uncolored; not absorbing color from a fluid; --
said of tissue.
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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 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.
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Achromatic telescope
(gcide) | Achromatic \Ach`ro*mat"ic\, a. [Gr. 'achrw`matos colorless; 'a
priv. + chrw^ma, chrw`matos, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
decomposing it into its primary colors.
[1913 Webster]
2. (Biol.) Uncolored; not absorbing color from a fluid; --
said of tissue.
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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 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.
[1913 Webster]Telescope \Tel"e*scope\, n. [Gr. ? viewing afar, farseeing; ?
far, far off + ? a watcher, akin to ? to view: cf. F.
t['e]lescope. See Telegraph, and -scope.]
An optical instrument used in viewing distant objects, as the
heavenly bodies.
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Note: A telescope assists the eye chiefly in two ways; first,
by enlarging the visual angle under which a distant
object is seen, and thus magnifying that object; and,
secondly, by collecting, and conveying to the eye, a
larger beam of light than would enter the naked organ,
thus rendering objects distinct and visible which would
otherwise be indistinct and or invisible. Its essential
parts are the object glass, or concave mirror, which
collects the beam of light, and forms an image of the
object, and the eyeglass, which is a microscope, by
which the image is magnified.
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Achromatic telescope. See under Achromatic.
Aplanatic telescope, a telescope having an aplanatic
eyepiece.
Astronomical telescope, a telescope which has a simple
eyepiece so constructed or used as not to reverse the
image formed by the object glass, and consequently
exhibits objects inverted, which is not a hindrance in
astronomical observations.
Cassegrainian telescope, a reflecting telescope invented by
Cassegrain, which differs from the Gregorian only in
having the secondary speculum convex instead of concave,
and placed nearer the large speculum. The Cassegrainian
represents objects inverted; the Gregorian, in their
natural position. The Melbourne telescope (see Illust.
under Reflecting telescope, below) is a Cassegrainian
telescope.
Dialytic telescope. See under Dialytic.
Equatorial telescope. See the Note under Equatorial.
Galilean telescope, a refracting telescope in which the
eyeglass is a concave instead of a convex lens, as in the
common opera glass. This was the construction originally
adopted by Galileo, the inventor of the instrument. It
exhibits the objects erect, that is, in their natural
positions.
Gregorian telescope, a form of reflecting telescope. See
under Gregorian.
Herschelian telescope, a reflecting telescope of the form
invented by Sir William Herschel, in which only one
speculum is employed, by means of which an image of the
object is formed near one side of the open end of the
tube, and to this the eyeglass is applied directly.
Newtonian telescope, a form of reflecting telescope. See
under Newtonian.
Photographic telescope, a telescope specially constructed
to make photographs of the heavenly bodies.
Prism telescope. See Teinoscope.
Reflecting telescope, a telescope in which the image is
formed by a speculum or mirror (or usually by two
speculums, a large one at the lower end of the telescope,
and the smaller one near the open end) instead of an
object glass. See {Gregorian, Cassegrainian, Herschelian,
& Newtonian, telescopes}, above.
Refracting telescope, a telescope in which the image is
formed by refraction through an object glass.
Telescope carp (Zool.), the telescope fish.
Telescope fish (Zool.), a monstrous variety of the goldfish
having very protuberant eyes.
Telescope fly (Zool.), any two-winged fly of the genus
Diopsis, native of Africa and Asia. The telescope flies
are remarkable for having the eyes raised on very long
stalks.
Telescope shell (Zool.), an elongated gastropod ({Cerithium
telescopium}) having numerous flattened whorls.
Telescope sight (Firearms), a slender telescope attached to
the barrel, having cross wires in the eyepiece and used as
a sight.
Terrestrial telescope, a telescope whose eyepiece has one
or two lenses more than the astronomical, for the purpose
of inverting the image, and exhibiting objects erect.
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Achromatically
(gcide) | Achromatically \Ach`ro*mat"ic*al*ly\, adv.
In an achromatic manner.
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Achromaticity
(gcide) | Achromaticity \Ach`ro*ma*tic"i*ty\, n.
Achromatism.
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achromatic color
(wn) | achromatic color
n 1: a color lacking hue; white or grey or black [syn:
achromatic color, achromatic colour] [ant: {chromatic
color}, chromatic colour, spectral color, {spectral
colour}] |
achromatic colour
(wn) | achromatic colour
n 1: a color lacking hue; white or grey or black [syn:
achromatic color, achromatic colour] [ant: {chromatic
color}, chromatic colour, spectral color, {spectral
colour}] |
achromatic lens
(wn) | achromatic lens
n 1: a compound lens system that forms an image free from
chromatic aberration |
achromatic vision
(wn) | achromatic vision
n 1: vision using the rods |
achromaticity
(wn) | achromaticity
n 1: the visual property of being without chromatic color [syn:
colorlessness, colourlessness, achromatism,
achromaticity] [ant: color, coloring, colour,
colouring] |
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