Different Movement Types of Coo Coo Clocks (Cuckoo Clocks)

There are two kinds of movements: one-day (30-hour) and eight-day movements. Some have musical movements, and play a tune on a Swiss music box after striking the hours and half-hours. Usually the melody sounds only at full hours in eight-day clocks and both at full and half hours in one-day clocks. Musical cuckoo clocks frequently have other automata which move when the music box plays. Today's Coo Coo Clocks (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 "cuc-koo" sound is created by two tiny gedackt (pipes) in the clock, with bellows attached to their tops. The clock's movement activates the bellows to send a puff of air into each pipe alternately when the clock strikes.