Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 247
ousthat a telescopeattached to suchan axis will alwaysmove in a circleof declination, andthat the clock,turning the tele-scope in one direc- FlG. 93.-EQUATORIAL TELESCOPE. tiQn ag fagt aS the Earth is carrying it in the opposite one, will keep the in-strument fixed on the object. It is inconvenient… … what will a telescope thus mounted always move ? How is the telescope kept MEASUEEMENT OF ANGLES. 241 437. For the other kinds of work, telescopes are mount-ed as Altazimuths, Transit-instruments, Transit-circles, andZenith-sectors. 438. Measurement of Angles.—In all these instruments,angles are…
Astronomy
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