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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).
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 ...
Hand-powered electrical equipment, such as a clockwork radio, where an energy-storing spring accounting for much of the size and weight of the device rotates a much smaller electric generator; such equipment is very popular where batteries and mains power (house current) are scarce.
The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.
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During the 1930s, the company built a large factory at Guiseley near Leeds where most of its lamp and electric motor manufacturing was based. The lamp works closed in 2002, and the adjacent electric motor works closed in 2004. The entire site was demolished in 2006, [15] with the clock tower preserved and relocated to a new car park adjacent to ...
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