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Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...
The Lavet-type stepping motor has widespread use as a drive in electro-mechanical clocks [1] and is a special kind of single-phase stepping motor. Both analog and stepped-movement quartz clocks use the Lavet-type stepping motor (see Quartz clock). Through miniaturization, it can be used in wristwatches and requires very little power, making a ...
A submultiple controlled frequency generator then divided this down to a usable, regular pulse that drove a synchronous motor. [5] While this first version of the clock was crude; Morrison produced a more refined version in 1928. [2] A New York Times headline in October 1929 reported "Electrified Quartz Crystal Displaces Clock Pendulum". [6]
Metamec was a manufacturer of domestic clocks in the second half of the 20th century, and was based in Dereham, Norfolk, England. The name "Metamec" is derived from "metal-work and mechanics". The company started as an offshoot of the furniture manufacturers Jentique about 1941, [1] which made boxes for instruments and bombs during World War II.
An electric clock is a clock that is powered by electricity, as opposed to a mechanical clock which is powered by a hanging weight or a mainspring. The term is often applied to the electrically powered mechanical clocks that were used before quartz clocks were introduced in the 1980s. The first experimental electric clocks were constructed ...
Telechron was an American company that manufactured electric clocks between 1912 and 1992. "Telechron" is derived from the Greek words tele, meaning "far off," and chronos, "time," thus referring to the transmission of time over long distances. Founded by Henry Ellis Warren, Telechron introduced the synchronous electric clock, which keeps time ...
The invention of the verge and foliot escapement in c.1275 [87] was one of the most important inventions in both the history of the clock [88] and the history of technology. [89] It was the first type of regulator in horology. [6] A verge, or vertical shaft, is forced to rotate by a weight-driven crown wheel, but is stopped from rotating freely ...
Casio F-91W digital watch, a historically popular watch. A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical processes ...
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