Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 326
tion axis is at-tached the telescope tube T, andalso the declination circle C. The advantages of this mount-ing are very great. In the firstplace, when the telescope is oncepointed upon an object, it is notnecessary to move the declination axis at all in order to keepthe object in the field, but… … Fig. 86. — The Equatorial. 1 We may add that it must, of course, be mounted where it can bepointed directly at the stars, without any intervening window-glass be-tween it and the object. We have known purchasers of telescopes tocomplain bitterly because they could not see Saturn well through a…
Astronomy
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