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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.
Roberto Bertotti (born 1967), Italian watchmaker, fixing most of the watches, clocks, chronometers, Pendulum clocks, etc. Workshop in Rovereto, Italy. Masahiro Kikuno (born 1983), , Japanese watchmaker, created the first wristwatch with a Japanese clock complication. Andrzej Trojanowski (born 1979), independent watchmaker based in Warsaw, Poland.
The following is a list of notable companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. In some instances the "company" consisted of a single person.
Bulova claims to have been the first manufacturer to offer electric clocks beginning in 1931, but the Warren Telechron Company began selling electric clocks in 1912, 19 years prior to Bulova. In the 1930s and 1940s, the brand was a huge success with its rectangular plated watches whose case was strongly curved to better fit the curve of the wrist.
The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. [39]
Wittnauer is a watch and clock company, founded in New Rochelle, New York in 1885 by Swiss immigrant Albert Wittnauer, that is now a brand of the Bulova company, which is owned by Japanese conglomerate Citizen Watch Co.
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