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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]
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] A design patent was applied for on November 13, 1985, which was issued as D299127 on December 27, 1988. [5]
The clapper on an English handbell is on a hinge and moves back and forth in a single direction, unlike a school bell in which the clapper swings freely in any direction. It also has a spring that holds the clapper away from the casting after the strike to allow the bell to ring freely.
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 ...
Tesla, for example, invented a coherer in which the tube rotated continually along its axis. In later practical receivers the decoherer was a clapper similar to an electric bell, operated by an electromagnet powered by the coherer current itself. When the radio wave turned on the coherer, the DC current from the battery flowed through the ...
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
These timelines of world history detail recorded events since the creation of writing roughly 5000 years ago to the present day. For events from c. 3200 BC – c. 500 see: Timeline of ancient history; For events from c. 500 – c. 1499, see: Timeline of post-classical history; For events from c. 1500, see: Timelines of modern history
The clapper is a rigid steel or wrought iron bar with a large ball to strike the bell. The thickest part of the mouth of bell is called the soundbow and it is against this that the ball strikes. Beyond the ball is a flight, which controls the speed of the clapper. In very small bells this can be nearly as long as the rest of the clapper.