Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 278
thestar-spectrum received? How is this light iisually obtained? 493. Describe the CELESTIAL PHOTOGKAPHY. 271 493. A very powerful Spectroscope was for some timeused at the Kew Observatory, in England, for mapping thesolar spectrum. The light enters at a narrow slit in oneof the collimators, which… … 494. It is often convenient to use what is termed aDirect-vision Spectroscope—that is, one in which the light enters and leaves theprisms in the same straightline. How this is man-aged in the Herschel- Fig. 102.—Path op the Eat in the Heb- ° * # . schel-bbowning Spectboscope. one of the best of its…
Astronomy
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