A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 47
eir rate as much as half a second or more, and to do it somewhat irregularly. 54. The Chronometer.—The pendulum-clock not being portable,it is necessary to provide time-keepers that are. The chronometer ismerely a carefully made watch, with a balance wheel compensatedto run, as nearly as possible,… … Fig. 14. —A Chronograph by Warner and Swasey. The box-chronome/er used on ship-hoard is usually about twice the diameterof a common pocket watch, and is mounted on gimbals, so as to keep hori-zontal at all times, notwithstanding the motion of the vessel. It usuallybeats half-seconds. It is not…
Astronomy
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