Society of Motion Picture Engineers : incorporation and by-laws (1922)

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(c) Distance between the centres of successive sprocket holes. .187" .1968" (d) Sprocket holes on the two sides of the film shall be directly opposite each other. (e) Each sprocket hole shall be that part of a circle contained between two cords of equal length perpendicular to the length of the film. Diameter of circle .110" (2.79 mm) .087"(2.21 mm) Distance between cords .073 (1.85 mm) .063" (1.60 mm) Recommended Practice (1) Thumb Mark. The thumb mark on a lantern slide should be located in the lower left hand corner next the reader, when the slide is held so that it can be read normally against a light. (2) Projection Angle. The projection angle should not exceed 12°. (3) Projection Lens Mounting. Should be such that light from all parts of the aperture shall have an uninterrupted path to the entire surface of the lens. (4) Projection Lens Focal Length. Tolerance not to exceed one percent of that indicated. (5) Leaders and Trailers. Shall be opaque with markings embossed in them. In a multiple reel story each trailer and the leader immediately following shall be marked with the same title.