The cuckoo clock has two kinds of mechanical movements: one-day (30-hour) and eight-day movements. Usually the melody sounds only at full hours in eight-day clocks and both at full hours and half hours in one-day clocks.
Today's cuckoo clocks are almost always weight driven, though a very few are spring driven. The weights are made of cast iron in a pine cone shape and the "cuckoo" sound is created by two tiny pipes in the clock, with bellows attached to their tops. In recent years, quartz battery-powered cuckoo clocks have been available. These do not have cuckoo bellows and are practical, efficient, and saves lot of time.
More Information about Cuckoo Clock Movement.
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