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James Russell Lowell, Among my books 2 2 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
t of the train. c. Besides these are devices not chronometric, as the hygrometric pendulum, ballistic pendulum, etc. Previous to the application of the pendulum, a fly-wheel was used, the vanes meeting the resistance of the air, forming a limit to the speed, as in the musical boxes of the present day. Such was probably the regulator in the clocks of the Saracens, which were moved by weights as early as the eleventh century; the clock which struck the hours, referred to by Dante (1265-1321); the clock in the old Palace Yard, London, put up about 1288 and remaining till the time of Elizabeth; the clock made by William of Wallingford in the reign of Richard II. （1377-85). Ebn Junis, of the University of Cordova, invented the timemeasuring pendulum, and his friend and fellow-philosopher, Gerbert, invented the escapement, as it is believed. Gerbert became, successively, schoolmaster at Rheims (where he had a clock), Archbishop of Ravenna, and Pope Sylvester II. He died by poi