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
adth, and contains all thecolours of the rainbow. In its simplest form the spectroscope contains only oneprism, which is placed between two telescopic tubes (Fig. 37).At the outside end of one tube there is placed the slit S, a verynarrow opening, which, by a delicate screw movement, can be… … Fui. 37. M.MlLE ^ItCTROsCOll . 106 A FOFULAB HANDBOOK AND ATLAS OF ASTRONOMY. the prism parallel to eacli other. After passing through the prism, and being refracted by it towardsits base, the rays now fall on the object-glass of the small viewing telescope, by which means they arebent to a focus,…
Astronomy
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