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Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 11. (ed. Frank Moore) 3 3 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
The Daily Dispatch: June 10, 1862., [Electronic resource] 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
e spaces between the teeth. Gear′ing. Wheels with cogs to transmit power. The term is also applied to other mechanical devices by which motion is transmitted; as, changegear, chain-gear, back-gear, overhead-gear; or by which parts are operated, as valve-gear, hoisting-gear, expansion-gear. Also to other devices involving an assemblage of parts, as running-gear of a wagon. Archimedes was acquainted with toothed wheelwork before the Christian era. Thomas Young does not doubt that Ebn-Junis, at the end of the tenth century, had applied the pendulum to the measurement of time, but ascribes the first combination of the pendulum with wheel-work to Santorio, in 1612. The hydraulic clock of Ctesibus, under Ptolemy Euergetes II., which gave the civil hours throughout the year at Alexandria, was, according to the description of Vitruvius, a real astronomical clock; a very complicated hydraulic machine, working by means of toothed wheels. It is not improbable that the clock