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School bell visible in St Johns School, Sydney, Australia (1872) Typical School bell in Austria (1978-2021) Sound of a School bell in Austria The ringing of a school bell announces important times to a school's students and staff, such as marking the beginnings and ends of the school day, class periods, and breaks.
The most widely used form is the interrupter bell, which is a mechanical bell that produces a continuous sound when current is applied. See animation, above. The bell or gong (B) , which is often in the shape of a cup or half-sphere, is struck by a spring-loaded arm (A) with a metal ball on the end called a clapper , actuated by an ...
Handbell techniques have changed very much over the years. Donald Allured, founding director of Westminster Concert Bell Choir, is credited with fully realizing an American off-the-table style of ringing that includes many non-ringing sound effects including stopped techniques such as plucking the clapper with the bell on the table. He is also ...
As the bell swings higher the sound is projected outwards rather than downwards. 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.
In addition, the movement of the bell imparts a Doppler effect to the sound, as the strike occurs whilst the bell is still moving. Both these effects give full circle ringing of bells in an accurate sequence a distinctive sound which cannot be simulated by stationary chimed bells.
The Angelus, depicting prayer at the sound of the bell (in the steeple on the horizon) ringing a canonical hour.. Oriental Orthodox Christians, such as Copts and Indians, use a breviary such as the Agpeya and Shehimo to pray the canonical hours seven times a day while facing in the eastward direction; church bells are tolled, especially in monasteries, to mark these seven fixed prayer times.
In English-style ringing the bell is rung up such that the clapper is resting on the lower edge of the bell when the bell is on the stay. During each swing, the clapper travels faster than the bell, eventually striking the soundbow and making the bell sound. The bell speaks roughly when horizontal as it rises, thus projecting the sound outwards ...
Ellacombe apparatus for six bells. The Ellacombe apparatus is a mechanism devised for performing change ringing on church bells by striking stationary bells with hammers. It does not produce the same sound as full circle ringing due to the absence of Doppler effect as the bells do not rotate, and the lack of a damping effect from the clapper after each strike.