Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 352
of the two yellow rays and the green ray of mercury inreference to these standards :— The rays from both the sources are simultaneously throwninto the apparatus, and it is absolutely indispensable that thetwo beams of light should be exactly superposed. The methodused is shown in Fig. 132, where T… … Fig. 132. interferometer is placed at I; the rest of the apparatus explainsitself. It is necessary in making these measurements that thewave-lengths of the rays to be dealt with be approximatelyknown; these may, of course, be readily found with a grating,and the values used in this investigation…
Spectrum analysis
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