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Projection booth
A projection booth (US English), projection box (British English) or Bio box (Australian English) is a room or enclosure for the machinery required for the display of movies on a reflective screen, located high on the back wall of the presentation space. It is common in a movie theater.
==History==
During the early cinema period (1895 to the late '00s approximately), the projector was typically located and operated within the theater auditorium itself. The move to physically segregated projection booths resulted from the emergence of auditoria specifically designed for the projection of movies, which was caused by a combination of the growing popularity of cinema and increasing concerns over the safety risks of nitrate film. Projection booths that were segregated and equipped with fire prevention, fighting and containment infrastructure gradually became a legal requirement throughout the developed world. A typical example of the regulation that emerged during this period was the fire safety provisions of the Cinematograph Act 1909 in the United Kingdom.
Historically, movie projectors prior to modern automation would include a bell, activated by centrifugal force when the supply reel reached an appropriate speed. Two projectors would be used, requiring that the projectionist switch between the "operating" and "ready" projectors when a cue mark was visible on the screen in the upper right corner. The bell alerted the projectionist (who had likely viewed the movie too many times to ensure alertness) that attention was required.
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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