Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 159
out on the celestialsphere the apparent diurnal path which this star will follow fromrising to setting. In most telescopes of the sort a driving-clock isarranged to turn the telescope round the polar axis at the same rateat which the earth itself turns about its own axis of rotation—at therate at… … NORTH Fig. 79. -A Small Equatorial Telescope Mounted on aPortable Stand. make an examination or observation of it for as long 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…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
