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550 STANDARDS ADOPTED [j. S. M. P. E.
10. Projector Lens Mounting.
The projector lens should be mounted in such a manner that light from all parts of the aperture shall have an uninterrupted path to the entire surface of the lens.
1 1 . Projection Lens Focal* Length.
The focal length of motion picture projection lenses should increase in x/4 inch steps up to 8 inches and in x/2 inch steps from 8 to 9 inches.
12. Projection Objectives, Focal Markings.
Projection objectives should have the equivalent focal length marked thereon in inches and quarters and halves of an inch, or in decimals, with a plus (+) or minus (— ) tolerance not to exceed 1% of the designated focal length also marked by proper sign following the figure.
13. Leaders for Sound-on-Film Positive.
Manufacturers of sound film should place a leader on each roll of film on which is designated the framing of the picture and the corresponding sound.
14. Projector Apertures for Sound-on-Film Practice.
The Society approves the proposals of the joint committee of the Academy of Motion Picture Arts and Sciences, Technicians' Branch, the American Society of Cinematographers, the Pacific Coast Section of the Society of Motion Picture Engineers, and the American Projection Society relative to practice in the photography and projection of sound-on-film, which is as follows:
"WHEREAS, Investigation has revealed wide variance in theater projection practices and that there is no effective standard aperture for projection of sound-on-film talking motion pictures;
"Be it resolved: That as a temporary measure this committee recommends that all studios and cinematographers using sound-on-film methods make marks on the camera ground glass equally spaced from the top and bottom in addition to the mat mark for the sound track ; these marks to delineate a rectangle 0.620 by 0.835 inch in size and that