Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 146
eal clock, which is an indispensable adjunct of thetransit instrument. It stands near it so that the dial ofthe clock can be seen and so that the beats of the pendu-lum can be heard every second. A skilled observer canestimate the time to the nearest tenth of a second. Thefirst transit-instrument… … Fig. 70.—A Transit-instrument. 126 ASTRONOMY. minate in accurately cylindrical pivots which rest in metallic bearingsVV which are shaped like the letter Y, and hence called the Ys.The object-glass of the telescope is at the upper end of the tube inthe drawing. The eyepiece is at E. The telescope…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
