![]() Quartz clocks are electric clocks which keep time by counting oscillations of a vibrating quartz crystal.All battery-powered clocks have been largely replaced by the lower cost quartz movement. Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. These were only made in battery-powered form. ![]() Tuning Fork clocks keep time by counting the oscillations of a calibrated tuning fork with a specific frequency. ![]() This was the most common type of clock from the 1930s but has now been mostly replaced by quartz clocks. While the actual frequency may vary with loading on the grid, the total number of cycles per 24 hours is maintained rigorously constant, so that these clocks can keep time accurately for long periods, barring power cuts over months they are more accurate than a typical quartz clock. They essentially count cycles of the power supply.
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