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Lavet-type stepping motor of a quartz clock. A black rotor sprocket provides the mechanical output. 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).
These motors, however, were housed in the elegant cases of mantel and grandfather clocks for which Herschede was known; moreover, these clocks were equipped with chimes. Telechron—now the "Clock and Timer Division" of GE—declined in the 1950s, mainly because batteries had become much more long-lived and reliable.
Synchronous motor clocks are rugged because they do not have a delicate pendulum or balance wheel. However, a temporary power outage will stop the clock, which will show the wrong time when power is restored. Some synchronous clocks (e.g. Telechron) have an indicator which shows if it has stopped and restarted.
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The following is a list of American companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. Samuel Abbott; Montpelier, Vermont (1830–1861) Ansonia Clock Company; Ansonia, Connecticut and Brooklyn, New York (1851–1929)
During the 1970s, many of the mechanical clocks were changed to use the electric motors made by the Smith parent company. However, J. B. Joyce continued to operate as a separate company, with mainly heritage work being carried out in the factory up to 2012, when a timed-bid auction was held to sell off surplus equipment, tools, and clock parts ...
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