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The Clapper is a sound-activated electrical switch, [1] sold since 1984 by San Francisco, California based Joseph Enterprises, Inc. Joseph Pedott marketed the clapper with the slogan "Clap On! Clap Off! The Clapper!". [2] The Clapper plugs into a U.S.-type electrical outlet, and allows control of up to two devices plugged into the Clapper. [3]
Some use an integral hammer that strikes the wood, while others use a piece of wood that rides over a gear to make a clicking noise. [10] Historian James Stevens Curl considered the crotalus a descendant of earlier sistrum, an ancient Egyptian ritual instrument. Historically, the crotalus was common in Maundy Thursday Ethiopic liturgies. [11]
Joseph Enterprises was founded in California in 1981 by Joseph Pedott. The Clapper, whose slogan is "Clap On! Clap Off!", was first sold to the public on September 1, 1985. A trademark was filed on the brand name "Clapper" with the U.S. Patent and Trademark Office on July 9, 1986. [4]
The product: The Clapper The price: $24.95 plus $6.95 shipping and handling for a total of $31.98. The claims: It turns up to two plug-in lights or equipment on and off with claps. The Buy-o-meter ...
The magnetic field of the electromagnet collapses, and the clapper springs away from the bell. This closes the contacts again, allowing the current to flow to the electromagnet again, so the magnet pulls the clapper over to strike the bell again. This cycle repeats rapidly, many times per second, resulting in a continuous ringing.
Several specific forms of clapper have their own names, such as the Chinese guban, Japanese hyoshigi, or the Korean bak. In the classical music of Thailand, a similar instrument is called krap . In India cooking tongs or cimṭā are often used to provide rhythm while singing religious hymns in many areas (sometimes tongs made specifically for ...
Clapper (musical instrument), consisting of two pieces of wood struck together; Clapper bridge, an ancient form of bridge; Clapper Post, urban postal service in 18th century Vienna; Clapperboard, used in film production to aid synchronizing audio and video and to identify different shots; The Clapper, a sound activated electrical switch
Clapperboard. A clapperboard, also known as a dumb slate, clapboard, film clapper, film slate, movie slate, or production slate, is a device used in filmmaking, television production and video production to assist in synchronizing of picture and sound, and to designate and mark the various scenes and takes as they are filmed and audio-recorded.