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A MODEL PROJECTION ROOM
23
shutters made of No. 10 gauge iron and set in iron guides one or more inches wide at the sides and bottom. When closed, the shutter must overlap the top of the port by at least one inch. For complete fire protection, all shutters must be interconnected so that they will close simultaneously upon the operation of a mechanical releasing device or the operation of a fusible link. Each shutter must have its individual
Electrical Conduits and Circuits
The location of the projectors should previously be determined so that the electrical conduits may be properly located under the projector bases. When the booth is provided with two projectors, their exact centers should be two feet six inches on either side of the median line of the theatre. The only variance in the location of projectors will be the distance from the center
MEDIAN LINE OF THEATRE
SPOTL/QHT PORT
PROJECTOR PORTS
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PRE-AMPLIEIER CONTROL CABINET
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OBSERVATION PORTS
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STAGE CURTAIN SWITCHES
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A WALL RECEPTACLES
B CONDUIT IN WALL TO D C CONTROL PANEL
A NO MOTOR GENERATOR FOR SPOT VIA
POLAR IZgp PLUG BOX. C RECEPTACLES FOR WALL MOUNTED CHANQE OVERS. D DIMMER AND EMERQENCY L/QHT/Nq CONTROL
Wiring diagram of the front wall of projection room.
fusible link above it, and a fusible link shall be located as well above each upper projector magazine which upon operation closes all of the port shutters. The projectionist must be able to close the shutters manually from any projector head and from each exit. The shutters should be kept closed when not in use, and some theatres close all shutters at the end of the show as a means of testing their operation.
of the projector base to the front wall, which will vary from thirty inches to 43 7/16 inches, depending upon the angle of tilt of the projectors and the type of sound reproducers to be used. All Motiograph projectors and most other standard projectors of modern design have an opening in the base long enough to provide for this variance. The conduits for arc lamps and projectors therefore may be installed thirty inches from the front wall, regard