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1952 Theatre Catalog, 10th Edition, Page 28 (xxviii)

1952 Theatre Catalog, 10th Edition
1952 Theatre Catalog
1952 Theatre Catalog, 10th Edition, Page 28
Page 28

1952 Theatre Catalog, 10th Edition, Page 28





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FIG. 23-The observation port (lelt) should be closed with a good grade of plate glass. set in a lmme which will permit easy cleaning on both sides. If glass is tilted from the perpendicular it will overcome reflections and improve the critical View oi the watching projectionist. The projection port (right) should enioy a good grade of optical glass set in a frame that can be adjusted to the proiection angle. It also should be easily removed {or daily cleaning. Recommended installation methods can he noted.


Two portholes are required for each projection machine, one for observation and the other for the light beam, and, while the size of these ports is sometimes set by local regulations, the average and sufficient size is 10 inches square for the projection port and 10 by 12 inches for the observation openings. Both ports should be incloscd with glass in adjustable frames. A high grade of optical glass should be used in the projection opening, and this glass should be in a frame which can be adjusted to be normal to the projection angle. A good grade of plate glass should be used for closing the observae tion ports, and the glass should be sot in a frame that may be easily adjusted to facilitate cleaning on both sides. The operator will have a better view out of the observation port if the glass is tilted slightly to overcome reflections from house lights and tho scrcen.

With spotlights in the booth, portholcs to accommodate them will have


to be much larger than the others in order to allow the spots to pivot horizontally and vertically to cover the entire stage. Spotlight openings should be closed with polished wire glass set in removable stops. As this opening is necessarily large, the glass should be set in a frame with metal stops, without provision for hinging.

Specially shaped openings are required for effect machines and stcrcopticons, and should this equipment be contemplated the manufacturer should be consulted so that booth openings can be tailored to specifications.

It is mandatory that projection and observation openings be protected on tho projection room side with safety shutters of steel or transite board which will close automatically if fire breaks out anywhere in the booth. A system of fusible links and cords holds those shutters open. A metal shaft is installed on ball-bearing hangers above the openings and extends the full length of the front wall of the booth. The shaft

has pegs inserted over the center of each opening from which the safety shutter is hung by means of a fusible link or a cord. Each cord is looped OVer the proper peg on the shaft, and on one end of the shaft is a counterweighted arm held in position through an arrangement of cords and pulleys with the cord running over the center of the machines and broken with fusible links at each machine. When the cord is severed, the counterweight drops, and the loops slip off the pegs, allowing all safety shutters to fall into the closed position. Provision for manually dropping the shutters should also be made at each booth exit. Counterweights should be placed on the cords operating safety shutters on large booth openings.

Electrical Ou'l'lel's

If new sound and projection equipment is to be installed, wiring diagrams should be obtained from the manufacturer of the equipment. Conventional outlets Should be installed in the front wall of each projection booth, at each machine location for connecting trouble lights and soldering irons, if these are not built into the equipment,

Mechanical and gravity ventilation is necessary in the booth, with one system directly connected to the lamphouses.

Even though local codes do not always compel the inclusion of two exits at opposite ends of the booth, these should be provide for the safety of the projectionists.


Sl'age Floor

If the floor of the stage is in bad condition it should be repaired of course. Old wooden floors may be, covered with dark, dull finish linoleum, or stained a dark color to prevent reflection of light from the projectors. If the floor is in an irreparable condition, it should be replaced with a concrete structure.

If it is decided to tear the stago down to a platform three or four foot above the orchestra floor, this platform can greatly add to the beauty of the auditorium if properly treated. Draperies of appropriate color and design, hung from the proscenium arch and closed to the picture help make the platform the focal point of the house. The scrcon curtain should be hung on a track, and opened and closed by means of an electric curtain machine controlled by push buttons on the stage and in tho projection booth.

Footlights, borderlights, or floods in the auditorium ceiling also operated from the projection booth, should be planned for lighting the platform and for illuminating the screen curtain and stage set at the opening and closing pcriods. A system of slowly revolving colorod lights may be used to play a dazzling cascade of artistic effects on the stage curtain between shows.

It. should be pointed out that the stage may not be used as such in some localities because of agreements with the local stagchandsy union. Before any alteration which contemplates future uses of the stage is started, it is a good idea to consult the local stagehandsl union.

1952 Theatre Catalog, 10th Edition, Page 28