Measurements on the index of refraction of air for wave lengths from 2218 A to 9000 S (1919)
National Bureau of Standards · leaf 19
nder A, whose ends are closed with quartz windows. An image of the circular fringes produced by meter is projected upon the slit S of a spectrograph a quartz fluorite achromatic objective L2. For st of the work a grating spectrograph was used with the grating mounted in parallel light as shown in… … Fig. 1.—Grating spectrograph
Light refraction
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