(Spec`tro*log"ic*al) a. Of or pertaining to spectrology; as, spectrological studies or experiments.
(Spec*trol"o*gy) n. [Spectrum + -logy.] (Chem.Phys.) The science of spectrum analysis
in any or all of its relations and applications.
(Spec*trom"e*ter) n. [Spectrum + -meter.] (Physics) A spectroscope fitted for measurements
of the luminious spectra observed with it.
(Spec`tro*pho*tom"e*ter) n. [Spectrum + photometer.] (Opt.) An instrument for
measuring or comparing the intensites of the colors of the spectrum.
(Spec"tro*scope) n. [Spectrum + -scope.] (Physics) An optical instrument for forming
and examining spectra (as that of solar light, or those produced by flames in which different substances
are volatilized), so as to determine, from the position of the spectral lines, the composition of the substance.
(Spec`tro*scop"ic Spec`tro*scop"ic*al) , a. Of or pertaining to a spectroscope, or spectroscopy.
(Spec*tros"co*pist) n. One who investigates by means of a spectroscope; one skilled in
the use of the spectroscope.
(Spec*tros"co*py) n. The use of the spectroscope; investigations made with the spectroscope.
(Spec"trum) n.; pl. Spectra [L. See Specter.]
1. An apparition; a specter. [Obs.]
2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction
of a prism or other means, and observed or studied either as spread out on a screen, by direct vision,
by photography, or otherwise. See Illust. of Light, and Spectroscope. (b) A luminous appearance,
or an image seen after the eye has been exposed to an intense light or a strongly illuminated object.
When the object is colored, the image appears of the complementary color, as a green image seen after
viewing a red wafer lying on white paper. Called also ocular spectrum.
Absorption spectrum, the spectrum of light which has passed through a medium capable of absorbing
a portion of the rays. It is characterized by dark spaces, bands, or lines. Chemical spectrum, a
spectrum of rays considered solely with reference to their chemical effects, as in photography. These,
in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but
are not limited to this region. Chromatic spectrum, the visible colored rays of the solar spectrum,
exhibiting the seven principal colors in their order, and covering the central and larger portion of the
space of the whole spectrum. Continous spectrum, a spectrum not broken by bands or lines,
but having the colors shaded into each other continously, as that from an incandescent solid or liquid,
or a gas under high pressure. Diffraction spectrum, a spectrum produced by diffraction, as by a
grating. Gaseous spectrum, the spectrum of an incandesoent gas or vapor, under moderate, or
especially under very low, pressure. It is characterized by bright bands or lines. Normal spectrum,
a representation of a spectrum arranged upon conventional plan adopted as standard, especially a spectrum
in which the colors are spaced proportionally to their wave lengths, as when formed by a diffraction
grating. Ocular spectrum. See Spectrum, 2 (b), above. Prismatic spectrum, a spectrum
produced by means of a prism. Solar spectrum, the spectrum of solar light, especially as thrown
upon a screen in a darkened room. It is characterized by numerous dark lines called Fraunhofer lines.
Spectrum analysis, chemical analysis effected by comparison of the different relative positions and
qualities of the fixed lines of spectra produced by flames in which different substances are burned or
evaporated, each substance having its own characteristic system of lines. Thermal spectrum, a