Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 717
escope, which differ with different wave-lengths. For purposes of comparison a bright scale of equalparts in L is often so arranged that its image by reflectionis made to coincide with the spectrum; or a portion of theslit is illuminated by light from some standard source, andthe other portion with… … FlG. 457. ure the deviation produced in passing through the prism, itis called a spectrometer, of which a simple form is shown inFig. 457. 606. Spectrum Analysis. — It has been found that eachelement in the gaseous state emits a discontinuous spectrum,
Physics
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