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Doorbell at the entrance of Chetham's Library, Manchester, England Sound of a two-tone mechanical doorbell. A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first ...
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 electromagnet ...
Fox News is doing away with the doorbell sound it used during debates to signal when a candidate’s time speaking is up. The change, which comes just days before the first Republican primary ...
The basic core component of a conventional bell box is an electromagnet and a bell or other metal piece, some of which create a repetitive sound. [1] The bell sound is normally created inside the box, although the unit may have bells mounted on the outside of the box. The bell box may also include visual alerts such strobe or other flashing lights.
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If you have a chime-style doorbell, you need a diode behind the bell or the chimes will not complete the entire melody. Since this entry mentions doorbells that sound Westminster chimes, it would be useful to have a diode included somewhere in the diagram or the commentary. TaxAcc0untant 13:41, 10 July 2010 (UTC)
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