A popular handbook and atlas of astronomy, designed as a complete guide to a knowledge of the heavenly bodies and as an aid to those possessing telescopes (1891)
Peck, William, Sir, 1862-1925 · New York, G. P. Putnam's Sons · leaf 168
that year, WoUaston, while casually lookingthrough a prism at a narrow opening in a window,observed that the coloured band, or spectrum, was crossedby a number of dark lines parallel to the slit. This ledto the invention of the spectroscope, and to the mappingof the lines by the German optician,… … Fig. 36. a modern reflector equatori.\lly mounted,constructed by the author. prism is not only decomposed, it isalso refracted out of its original course, the amount of divergence depending on the colour. The nearer theray approaches the red colour, the less it is refracted, and thus the red or…
Astronomy
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