Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 161
ong a time as is re-quired. If we place a photographic plate in the focus of a suitableobjective mounted equatorially we can obtain a long-exposure pictureof the star-groups to which it is directed, and so on. The student should make a model of the essential parts of anequatorial mounting out of… … x m: Fig. 81.—An Equatorial Telescope Pointed at a Star inthe North-eastern Region of the Sky. ASTRONOMICAL INSTRUMENTS. 141 axis DL capable of being turned round the head of the polar axis N;a long stick TT to stand for a telescope (mark the object-glass end ofit). The whole should be mounted on a…
Astronomy
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