Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 169
ACTICE 153 fundamental principle of the instrument lies in the stereoscopiccomparison of the unknown spectrum with a standard. It istoo complex to describe in detail. In the older forms of instrument two microscopes areemployed, involving the use of both eyes. In the modernform of this instrument… … Fig. 60. with the view of finding whether the standard and the unknownspectra are correctly situated with regard to each other. Inorder to permit of this being done, it is advisable to arrangethat the unknown spectrum should show some known lines;for example, in the case of a gas in a vacuum tube a…
Spectrum analysis
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