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May, 1930] STANDARDS ADOPTED 547
8. 16 mm. Feed Sprockets.
The dimensional standards relating to this element are shown in Chart 8. It should be noted that dimensions are given relating to sprockets having 5, 6, 7, and 8 teeth, and also dimensions relating to these sprockets when designed for 2, 3, and 4 teeth in contact with the film.
9. 16 mm. Take-Up (Hold-Back) Sprockets.
The dimensions are shown in Chart 9.
10. 16 mm. Combination (Feed and Take-Up) Sprockets.
The dimensions are shown in Chart 10.
11. 16 mm. Camera and Projector Apertures.
The dimensions are shown in Chart 11.
12. 16 mm. Splices.
The dimensions are shown in Chart 12.
13. Width of Film Track in 16 mm. Cameras and Projectors.
A clearance of 0.005 inch (0.13 mm.) shall be allowed in the construction of the film track in cameras and projectors using 16 mm. film. The standard cutting width (see Chart 4) is 16.0 mm. (0.62992 inch). This dimension is the upper limit and gives
Width of film track = 16.13 mm. (0.63492 inch).
14. Taking Speed, Standard 35 mm. Sound Pictures.
This shall be 24 pictures per second.
15. Projection Speed, Standard 35 mm. Sound Pictures.
This shall be 24 pictures per second.
16. Scanning Line.
a. Position relative to picture aperture
The scanning line (for combined sound and picture on 35 mm. film) shall be located at an average distance of 14.5 inches measured along the film below the center of the picture gate.
b. Transverse position relative to the guided edge of positive film
The position and dimensions of the scanning line shall be as shown in Chart 13.