A cuckoo clock is a clock, typically pendulum driven, that strikes the hours using small bellows and pipes that imitate the call of the Common Cuckoo in addition to striking a wire gong. The mechanism to produce the cuckoo call was installed in almost every kind of cuckoo clock since the middle of the eighteenth century and has remained almost without variation until the present.

Characteristics

image:World's Largest Cuckoo Clock.jpg The design of a cuckoo clock is now conventional. Most are made in the "traditional style" (also known as "carved") or "chalet" to hang on a wall. In the "traditional style" the wooden case is decorated with carved leaves and animals. Most now have an automaton of the bird that appears through a small trap door while the clock is striking. The bird is often made to move while the clock strikes, typically by means of an arm that lifts the back of the carving.

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. The melody sounds only at full hours in the eight-day clocks and both at full hours and half hours in one-day clocks. Musical cuckoo clocks frequently have other automatisms which move when the music box plays. Today's cuckoo clocks are almost always weight driven, 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.

In recent years, quartz battery-powered cuckoo clocks have been available. These do not have genuine cuckoo bellows. The cuckoo bird flaps its wings as it calls to the sound of running water in the background. The call is an actual recording of a cuckoo in the wild. During the cuckoo call the double doors open and the cuckoo emerges only at full hour, and they do not have a gong wire. One thing that is unique about the quartz cuckoos is that it has a light sensor, so when you turn your lights off at night, it automatically turns off the cuckoo call. The weights are conventionally cast in the shape of pine cones made of plastic, as well as the cuckoo bird and hands. The pendulum bob is often another carved leaf. The dial is usually small, and typically marked with Roman numerals.

History

A precursor to the cuckoo clock was the elephant clock invented in 1206 by the Arab inventor, Al-Jazari. It featured a humanoid automaton in the form of a mahout striking a cymbal and a mechanical bird chirping after every hour or half-hour.The Machines of Al-Jazari and Taqi Al-Din, Foundation for Science Technology and Civilization