Blue with an Arabic glass dial and silver pendulum Made It features a swinging polished brass pendulum, a brass finish case, Roman numeral dial with brass rims and Quartz, Time only movement. Measures Approximately: H:
German Antique Clocks with Pendulum/Moving Parts for sale | eBay
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DE202012004200U1 - Electric pendulum clock with double drive - Google Patents
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 a harmonic oscillator : it swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates. From its invention in by Christiaan Huygens until the s, the pendulum clock was the world's most precise timekeeper, accounting for its widespread use. The home pendulum clock was replaced by cheaper synchronous electric clocks in the s and '40s, and they are now kept mostly for their decorative and antique value. Pendulum clocks must be stationary to operate; any motion or accelerations will affect the motion of the pendulum, causing inaccuracies, so other mechanisms must be used in portable timepieces.
Effective date : Precision pendulum with an electric direct drive, characterized in the driving pulse in the Pendelher- and Pendelhinbewegung is issued. Stand der Technik State of the art. For the accuracy of clocks the amplitude stability is of great importance.