In the
prismatic spectrum the less refrangible rays are compressed into a
much smaller space than in the diffraction spectrum.
LECTURE VI.
PRINCIPLES OF SPECTRUM ANALYSIS
PRISMATIC ANALYSIS OF THE LIGHT OF INCANDESCENT VAPOURS
DISCONTINUOUS SPECTRA
SPECTRUM BANDS PROVED BY BUNSEN AND KIRCHHOFF TO BE CHARACTERISTIC
OF THE VAPOUR
DISCOVERY OF RUBIDIUM, CAESIUM, AND THALLIUM
RELATION OF EMISSION TO ABSORPTION
THE LINES OF FRAUNHOFER
THEIR EXPLANATION BY KIRCHHOFF
SOLAR CHEMISTRY INVOLVED IN THIS EXPLANATION
FOUCAULT'S EXPERIMENT
PRINCIPLES OF ABSORPTION
ANALOGY OF SOUND AND LIGHT
EXPERIMENTAL DEMONSTRATION OF THIS ANALOGY
RECENT APPLICATIONS OF THE SPECTROSCOPE
SUMMARY AND CONCLUSION.
We have employed as our source of light in these lectures the ends of
two rods of coke rendered incandescent by electricity. Coke is
particularly suitable for this purpose, because it can bear intense
heat without fusion or vaporization. It is also black, which helps the
light; for, other circumstances being equal, as shown experimentally
by Professor Balfour Stewart, the blacker the body the brighter will
be its light when incandescent. Still, refractory as carbon is, if we
closely examined our voltaic arc, or stream of light between the
carbon-points, we should find there incandescent carbon-vapour.
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