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A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator : It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.
The torsion pendulum has a period of precisely one minute; thirty seconds to rotate in one direction and thirty seconds to return to the starting position. This is thirty times slower than the 0.994 m (39.1 in) seconds pendulum typically found in a longcase clock, where each swing (or half-period) takes one second.
According to the Canadian Clock Museum, "approximately sixty-five catalogued models of mantel clock are known, as well as sixteen models of wall clock (with variations) and seven models of grandfather (hall) clock." [8] Rare samples exist of Pequegnat clocks built into a sideboard, or a grandfather clock/gramophone combination. Pequegnat was ...
Clocks from Winterhalder & Hofmeier are mechanical precision clocks with the quality standards of Black Forest craftsmanship. [4] [5] The numbers of the dial face are in Roman numerals. The dial face is embraced by wood. [6] The clocks can be identified by the engraved W & H SCH initial letters. Most of the clocks were made from 1850 to 1933.
Lenzkirch Clock Co (Aktiengessellschaft fur Ukrenfabrikation) (1851-1929) factory operated by Junghans 1929-1932; Mauthe Clock Company (c1870 - 1976) Jakob Schlenker Grusen, Schwenningen (JSGUS/ISGUS) (1888–present) Johannes Schlenker, Schwenningen (1822-1883) then Schlenker and Kienzle (1883-1897) then Kienzle
Hermle Clocks (HUM Uhrenmanufaktur GmbH & Co. KG) was founded in 1922 in the Gosheim, Swabian Alb region of Southern Germany by Franz Hermle & Sons. [1] By 1930, Hermle was leading in manufacturing and advanced operations. Even after the war, Hermle was still producing high standard clocks, along with producing clocks for other companies.
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