Journal of the Society of Motion Picture Engineers (1930-1949)

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May, 1930] STANDARDS ADOPTED 549 2. Leaders and Trailers. These should be opaque with markings embossed on them. In a multiple reel story each trailer and the leader immediately following should be marked with the same title. 3. Thumb Mark. The thumb mark on a lantern slide should be located in the lower left-hand corner next to the reader when the slide is held so that the slide can be read normally against the light. 4. Take-Up Pull. This should not exceed 15 ounces at the periphery of a 10 inch reel, or 16 ounces on an 11 inch reel. 5. Projection Lens Height. The standard height from the floor to the center of the projection lens of a motion picture projector should be 48 inches. 6. Projection Angle. This should not exceed 12 degrees. 7. Standard Observation Port. This should be 16 inches (40.6 cm.) square with its center 5 feet 3 inches (160 cm.) above the floor when the projection angle is zero, the center of the aperture to be lowered 1 inch (25.45 mm.) for each one degree drop in angle of projection. 8. Projector Speed.* The standard practice should be the projection of 80 feet of standard film per minute with a maximum of 85 feet and a minimum of 75 feet. 9. Camera Cranking Speed.* A camera taking speed of 60 feet of standard film per minute with a minimum of 55 feet and a maximum of 65 feet should be used when normal action is desired, in connection with the Society of Motion Picture Engineers' recommended practice of 80 feet per minute projection speed. * For 35 mm. silent pictures.