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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]
10 Days That Unexpectedly Changed America; 10 Things You Don't Know About; 101 Fast Foods That Changed The World [6] 101 Gadgets That Changed The World [7] 101 Inventions That Changed The World [8] 101 Objects That Changed The World [9] 101 Things That Changed The World; 102 Minutes That Changed America; 12 Days That Shocked the World; 1968 ...
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 History Channel's original logo used from January 1, 1995, to February 15, 2008, with the slogan "Where the past comes alive." In the station's early years, the red background was not there, and later it sometimes appeared blue (in documentaries), light green (in biographies), purple (in sitcoms), yellow (in reality shows), or orange (in short form content) instead of red.
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 ...
The bell will eventually stop when the dry piles have distributed their charges equally if the clapper does not wear out first. [5] [6] The Bell has produced approximately 10 billion rings since 1840 and holds the Guinness World Record as "the world's most durable battery [delivering] ceaseless tintinnabulation". [2]
Change ringing originated following the invention of English full-circle tower bell ringing in the early 17th century, when bell ringers found that swinging a bell through a much larger arc than that required for swing-chiming gave control over the time between successive strikes of the clapper. Ordinarily a bell will swing through a small arc ...