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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]
A clapper is a basic form of percussion instrument. It consists of two long solid pieces that are struck together producing sound. They exist in many forms in many different cultures around the world. Clappers can take a number of forms and be made of a wide variety of material. Wood is most common, but metal and ivory have also been used.
[6] [7] [8] Quizlet's blog, written mostly by Andrew in the earlier days of the company, claims it had reached 50,000 registered users in 252 days online. [9] In the following two years, Quizlet reached its 1,000,000th registered user. [10] Until 2011, Quizlet shared staff and financial resources with the Collectors Weekly website. [11]
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
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]
[29] [30] The clapper or tongue is manufactured in a similar process as the bell. Special care is given to cast the clapper at the proper weight, as a clapper that is too light will not bring out the true tones of the bell and a heavy clapper might cause the bell to crack. [15]
Larger bells may be swung using electric motors. In some places, such as the Salzburg Cathedral, the clapper is held against the sound bow with an electric clasp as the bell swings up. The clasp would release the clapper to provide a cleaner start to ringing. To silence the bell, the clasp catches and locks the clapper back in place. [14]
XI.160), it was made of shell and brass, as well as wood. Clement of Alexandria attributes the instruments invention to the Sicilians, and forbids the use thereof to the Christians, because of the motions and gestures accompanying the practice. [6] [7] Afterlife scene of a woman playing crotalum clappers leading a man playing a barbitos lyre.