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28 MOTION PICTURE PROJECTION
PROJECTION LENS FOCI. The focus of motion-picture projection lenses shall increase in V±" steps to 8 inches and from 8 to 9 in Mj-inch steps.
PROJECTION LENS MOUNTING. Picture projecting lenses shall be so mounted that the light from the film picture aperture shall have an uninterrupted full path to the rear component of the lens.
PROJECTING LENS HEIGHT. The standard height from the floor to the ceriteFof the projecting lens of a motion-picture machine shall be 48 inches.
PROJECTION LENS OPENING. The diameter of unit opening for projecting lens holder shall be 1 15/16 inch.
PROJECTION OBJECTIVES. Shall have the equivalent focal length marked thereon in inches and quarters and halves of an inch, in decimals, with a plus (+) or minus ( — i) tolerance not to exceed 1 per cent, of the designated equivalent focal length also marked by the proper sign following the figure.
REEL. The approved standard reel shall be 10 inches in diameter; 1V2 inches inside width; with 5/16-inch center hole, with a key-way Vs" by Vs" extending all the way through; a 2-inch hub; and a permissible flange wabble of not more than 1/16-inch.
STANDARD PICTURE FILM. Shall bo one and one-third inches wide, and carry a picture for each four perforations, the vertical position of the picture being longitudinal of the film.
STANDARD REEL FILM. Shall have black film leaders, with tinted (red, green or blue) trailers; should have marking thereon embossed rather than punched in the film; and each reel of a multiple-reel story should end with a title, and the next reel begin with the same title.
TAKE-UP PULL. The take-up pull on film shall not exceed 15 ounces at the periphery of a 10-inch reel or 16 ounces on a (11-inch) reel.