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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.
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 Riefler escapement is a mechanical escapement for precision pendulum clocks invented and patented [1] by German instrument maker Sigmund Riefler in 1889. [2] It was used in the astronomical regulator clocks made by his German firm Clemens Riefler from 1890 to 1965, [3] which were perhaps the most accurate all-mechanical pendulum clocks made.
The Kit-Cat Klock is an art deco novelty wall clock shaped like a grinning cat with cartoon eyes that swivel in time with its pendulum tail. It is traditionally black, but models in other colors and styles are also available. It is a common symbol of kitchens in North American popular culture. [1]
A flying pendulum clock is a clock that uses a flying pendulum escapement mechanism. A small metal ball, connected by string, wraps around one brass post, then unwinds before repeating on the other brass post. The flying pendulum clock was invented and patented in 1883 by Adler Christian Clausen and J. C. Slafter in Minneapolis.
This greatly reduced the energy consumed by the pendulum, and allowed longer pendulums to be used. While domestic pendulum clocks usually use a seconds pendulum 1.0 meter (39 in) long, tower clocks often use a 1.5 second pendulum, 2.25 m (7.4 ft) long, or a two-second pendulum, 4 m (13 ft) long. [1] [2]
Cuckoo clock, a so-called Jagdstück ("hunt piece"), Black Forest, c. 1900, Deutsches Uhrenmuseum, Inv. 2006-013. A cuckoo clock is a type of clock, typically pendulum driven, that strikes the hours with a sound like a common cuckoo call and has an automated cuckoo bird that moves with each note.
Galileo was the first to investigate the timekeeping properties of pendulums, beginning around 1603. [4] His interest was sparked by his discovery that, at least for small swings, the pendulum is isochronous: its period of swing is the same for different size swings.
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