Measurements on the index of refraction of air for wave lengths from 2218 A to 9000 S (1919)
National Bureau of Standards · leaf 19
Fig. 1.—Grating spectrograph … FiG. 2.—Prism spectrograph Anderson and possesses 39800 lines on a distance of 13.2 cm.The linear dispersion at P with this apparatus is about 10 A permillimeter in the spectrum of the first order. In the region of the spectrum where the waves are shorter than2800 A the reflecting power of speculum…
Light refraction
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