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photoplayer
The photoplayer is an automatic mechanical orchestra used by movie theatres to produce photoplay music to accompany silent films.
==Operation==
The central instruments in a photoplayer were a piano and percussion; some machines also added pipe organs and methods for manually creating sound effects. Like a player piano, the photoplayer played music automatically by reading piano rolls (rolls of paper with perforations), but the photoplayer could hold two rolls: one that would play while the other was prepared. Common sound effects included gunshots, bells and drums, which were generated by pulling chains called "cow-tails". Some photoplayers feature electric sound effects, such as sirens, automobile horns, and other oddities. A photoplayer operator had to load the paper rolls, start the machine and add the manual sound effects and percussion using the cow-tails.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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