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hich impinged upon the air, the latter affording a resistance proportioned to the size, number, radius, angle, and speed of the vanes.
Such was the case probably with: —
A. D. 1380, the clock erected by Richard of Wallingford, abbot of St. Albans.
During the same century a pulsating regulator was introduced into France.
A. D. 1364, Henry de Wyck, or de Vick, a German, erected a clock in a tower of the palace of Charles V., at Paris.
A. D. 1368, a striking clock was erected at Westminster.
A. D. 1370, clocks at Strasburg and Courtray, after which they became quite common.
The pulsating arrangement of Henry de Wyck consisted of an alternating balance, which was formed by suspending two heavy weights from a horizontal bar fixed at right angles to an upright arbor, and the movement was accelerated or retarded by diminishing or increasing the distance of the weights from the arbor.
This clock, which had no regulating spring, was the type of the astronomical clocks use