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Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. All battery-powered clocks have been largely replaced by the lower cost quartz movement. Quartz clocks These are electric clocks which keep time by counting oscillations of a vibrating quartz crystal. They use modern low-voltage ...
An early precision electric clock from the 1920s that uses a synchronous motor. The clock must first be started by spinning the main gear by hand. Above a certain size, synchronous motors cannot self-start. This property is due to rotor inertia; it cannot instantly follow the rotation of the stator's magnetic field.
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).
Telechron electric alarm clock. Telechron alarm clocks are particularly popular with collectors. Until about 1940, the overwhelming majority of Telechron alarm clocks had bell alarms. The entire mechanism was enclosed in a bell housing of steel. Atop the clock's coil was a metal strip that vibrated at 60 cycles per second when the alarm was ...
The Hammond clock model "Como" The Hammond Clock Company was founded in 1928 to produce and market clocks that were equipped with Hammond's new motor. The Hammond clock factory manufactured more than 100 different clock models, some simple and cheap, others made from expensive materials such as marble and onyx. [4]
The movements were mounted in cases of various designs, often in case styles similar to those of companies like Seth Thomas and E. Howard. [4] The SWCC appears to have been manufacturing their own clock movements by 1892, for they are all stamped "Self Winding Clock Co". Earlier movements were stamped with Seth Thomas or E. Howard markings. [5]
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