Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 235
t only will an image of the source be seen, but displaced on either side a series of spectra will be seen. The displacement of the spectra from the line joining the eye and light source will depend upon the number of lines per inch in the grating; the fewer lines per inch the less is the dis-… … Fig. 95. — Illustrating the Wood diffraction process. fine grating a spectrum of the source will be seen on the screen extending between aa. With a coarse grating a spectrum of the source will be formed between cc and a medium grating will produce a spectrum at bb. If the three gratings have…
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