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A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.
The Pennsylvania Manual (PDF). Vol. 117. Harrisburg: Pennsylvania Department of General Services. Archived from the original (PDF) on June 28, 2009. Trostle, Sharon, ed. (2007). The Pennsylvania Manual (PDF). Vol. 118. Harrisburg: Pennsylvania Department of General Services. ISBN 978-0-8182-0318-3. Archived from the original (PDF) on August 5 ...
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At rest one of the escape wheel teeth will be locked against a pallet. As shown in the diagram, the escape wheel rotates clockwise and the entrance tooth is locked in place against the entrance pallet, the lever held in place by the left banking pin. The impulse pin is located within the lever fork and the balance wheel is near its center position.
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