Definition of Spectrom
Spectrum, the name given to coloured and other rays of pure light
separated by refraction in its transmission through a prism, as exhibited
on a screen in a darkened chamber.
- Wikipedia
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 spectrum of rays considered solely with
reference to their heating effect, especially of those rays which
produce no luminous phenomena.
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 spectrum of rays considered solely with
reference to their heating effect, especially of those rays which
produce no luminous phenomena.
- Webster's Unabridged Dictionary (1913)
- A seemingly infinite range of possiblities, paradoxically confined by two extremes.
- A range of colours obtained by refraction (e.g. in a rainbow) or frequencies of electromagnetic waves. Visible, infrared, ultraviolet, radio spectrum,
- (linearalg) of a bounded linear operator A, the scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse
Latin
- a specter
- The Nuttall Encyclopedia
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