Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 139
the prism,the rays seen through the telescope are always those whichtraverse the prism at minimum deviation. This instrument isparticularly suited for the preliminary analysis of the lightbefore it enters an interferometer, or echelon grating (seeChapter IX). Recently this instrument has been… … Fig. 47. in wave-lengths. The eyepiece carries a spider web, which isadjusted on the spectrum line, and then the wave-length canbe read directly off on the drum-head. The spider web itselfmay be moved a little to either side by means of a small screwprojecting from the eyepiece, so that if at any…
Spectrum analysis
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