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1945 Theatre Catalog, 4th Edition, Page 350 (326)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 350
Page 350

1945 Theatre Catalog, 4th Edition, Page 350

Suggestions on Planning Projection Rooms

VA Cursory Review of Basic Specifications For the Most Efficiently Operated Booths

The modern projection room, properly designed for the greatest operating efiiciency, is divided into four separate and distinct units: (1) The projection room proper, (2) the rewind room, (3) the power-equipment room, and (4) the toilet and lavatory room.



In the design of the theatre, the location of the projection room is of prime importance in securing the finest possible screen image. Experience has shown that the projection room should be so located that the vertical projection angle approaches as nearly as possible the ideal angle of 0 degrees and never exceeds 14 degrees. Placing the projectors equidistant on each side of the theatre centerline and 5 feet apart is essential.

The projection room should not be so close to the screen that it would be necesary to use a projection lens less than 4 inches e.f., since sharp definition all over the screen area would not be possible. Nor should the projection booth be so far removed from the screen that a lens exceeding 7 inches e.f. would be required, as this lens would not be able to handle all the available light, with the result that screen illumination would be uneven.


The height of the projection room ceiling should never be less than 8 feet,

The material here presented has been compiled from the National Theatre Supply/s ffPlanning the

Projection Room," the Radio Corporation of Americais nPhotophone

Handbook for Projectionistsfi and other authoritative sources.

The blueprint drawings, presented here in fold-out pages, as well as the other illustrations, have been used through the courtesy of Walter E. Green, A. J. Lindsley, and the National Theatre Supply Division of National-Simplex-Bludworth, Inc.

and, in the Warmer latitudes, 12 feet is a more desirable minimum. The width and depth will vary with the amount of equipment installed and by whether the film rewinding and storing is to be incorporated in a separate room or in the projection room proper.

If a separate rewind room is provided, the width of the projection room should be 8 feet for one projector plus 6 feet for each additional projector, spotlight, stereopticon or effect machine. Thus, theraverage projection room containing two projectors and one stereopticon will be 20 feet wide. A depth of 10 feet will be .adequate. V

It is sometimes impractical to provide a separate rewind room and it then becomes necessary to allow more space in the projection room proper for this purpose. If the film rewinding and stor THE REWIND ROOM



ing facilities are provided for at the right or left side of the projectors, the projection room should be 16 feet wide for one projector plus 6 feet for each additional projector, spotlight, stereopticon or effect machine. The depth of the room will still remain 10 feet. It may be advantageous to provide the film rewinding and storage facilities at the rear of the projectors in which case the projection room should be calculated the same as if a separate rewind room was provided but the depth of the room should be a minimum of 12 instead of 10 feet.

Construction of projection rooms must be of approved fire resisting materials. The size of such rooms depends upon the type and number of projectors and other apparatus to be installed. When all equipment is installed there should be a minimum of 2 feet on either side and to the rear of such equipment (for working space) from either wall.

Where it is desired to rewind and inspect films in the projection room, it is well to consult local authorities on means that will be approved as to safety.

To insure access to and around professional projectors or apparatus, such machines should not be placed closer together than 4 feet with throws up to 75 feet, not closer than 4% feet with throws up to 125 feet, and not closer than 5 feet with throws over 125 feet. These measurements are based on the optical centers of the apparatus.

Floor Construction

It is important that the fioor of the projection room be constructed to provide for a minimum strength of 200 pounds to the square foot, plus the dead weight of the construction proper.

An entirely satisfactory door consists of (1) a reinforced concrete floor slab 4 inches thick, (2) a tamped cinder fill not less than 4 inches thick, and (3) a troweled cement finish 2 inches thick. The cinder fill and cement finish are provided to accommodate the concealed conduit.

For a still better Hoor surface, it may be topped with a high-grade cement, linoleum or similar floor-covering material, or painted to prevent fidusting" and thus to eliminate the chance of minute cement particles getting on the film and causing scratches.

Wall Construction

Brick, tile, or plaster blocks, finished on the inside with 34-inch of cement or acoustical plaster, form a satisfactory projection room wall.

The core of the wall should be at least 4 inches thick and all electrical conduit should be concealed in the wall. The ceiling should be constructed of 4inch concrete slabs, or pre-cast concrete, or of 3einch plaster blocks supported by a steel structure and be finished on the

1945 Theatre Catalog, 4th Edition, Page 350