A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 62
motion. This motion, since it is uni-form, can be, and in all large instruments usually is, given by clock-work, with a continuous regulator of some kind, similar to that usedin the chronograph. The instrument once directed and clamped,and the clock-work started, the object will continue apparently… … 50 ASTRONOMICAL INSTRUMENTS. time, provided we know its declination and right ascension, andhave the sidereal time ; for which reason a sidereal clock or chro-nometer is an indispensable adjunct of the equatorial.
Astronomy
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