Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 156
condition will be obtainedthat the line remains in perfect focus whichever way the prismis turned. This corresponds to perfect adjustment of both thecollimator and telescope for parallel rays. The second method is that devised by Lippmann,^ whoemploys two strips of plane-parallel glass plate, which… … Fig. 57. be convergent or divergent, the upper and lower halves of theimage of the slit will appear relatively displaced. The apparatusis shown in Fig. 57. In an ordinary spectrometer with achromatic glass lenses,when the collimator has been adjusted for giving parallel raysof one wave-length, this…
Spectrum analysis
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