Motion Picture News (Oct-Dec 1930)

October 11. 193 0 Motion Picture News 35 Wide Film Dealt Solar Plexus Blow As Engineers Ignore It in New Standards Big Guns Keeping It Locked in Lab Because Industry Unable To Stand Money Gaff (Continued from page 30) which have been in use, the Society merely giving them approval for the entire industry, and setting up a definite base from which to operate. Complete text of the standards adopted follow : Dimensional Standards 1. Dimensions of Newly Cut and Perforated Film. a. Standard 35 mm. negative film The dimensions for this material are shown in Chart 1. STANDARD 35M/„ NEGATIVE FILM Cutting Size. 1.37795 1.37598 Cuttings. Perforating Size. ChAKT 1 b. Standard 35 mm. positive film The dimensions for this material are shown in Chart 2. It will be noted that two forms of perforation may be used with this material, both forms being recognized as standard by the Society. c. Safety standard 28 mm. positive and negative film The dimensions for these materials are shown in Chart 3. d. Standard 16 mm. positive and negaative film The dimensions for these materials are shown in Chart 4. Frame Line. a. Standard 35 mm. film The frame line shall be half way between two successive perforations on each side of the film. b. Safety standard 28 mm. film The center of the frame line shall STANDARD 35"/M POSITIVE FILM 1.37795" CuttingSizf 7.37598" -1.109 — (ZS.169%) a o o b J3-P b o " o a to*) (34.35S.) S3* I'* T .0195 Rad. Apppox. (.495%) -.999' (Z53F5%) V.I 10 -A I I \-JI6IikA (e./9-x) (3%) Cutting b. Perforating Size. Chart 2 ,.0197 Rad. (5%) Essentials of Old Equipment Practices Remain Unchanged In New Set of Standards 5. pass through the center of a perforation on each side of the film. Film Splicing Specifications. Standard dimensional specifications for the making of film splices for laboratories and exchanges are given in Chart 5. Lantern Slide Mat Opening. 3.0 inches (76.20 mm.) wide by 2.25 inches (57.15 mm.) high. Motion Picture Projector Sprockets. a. Take-up sprocket SAFETY STANDARD 28M/„ POSITIVE &. NEGATIVE FILM Cut ting Size •la is. £ 1 10236 , Us-x.) ~ U0039'~~\ ?W~) B74"—\ i (zzzoi) SI n I $8 (JS/7.) .015 Rad. -, Apppox. Cutting e. Perforating Size. The take-up sprocket, which is a hold-back sprocket on a motion picture projector, should be designed to have the same pitch as the perforations on film which has shrunk to the maximum amount occurring in films of commercially useful condition as supplied by exchanges. This value of shrinkage is taken as 1.5%, and the dimensions of the standardized take-up sprocket are computed accordingly. The essential dimensions are: Base: diameter 0.9321 inch (23.67 mm.). Tooth thickness (at base) 0.050 inch STANDARD 16" /„ POSITIVE &. NEGATIVE FILM Cutting Size <r62735*\ (is.ssr.) K495'-i -*~w — ( A I 1ST ii s.i rii («<SW DIOIRad. APPROX (Z577-) 1 1 — S>g — \j07z\— ' (I.BZ37.) Cutting & Perforating Size. CHART 4 (1.26 mm.). Other dimensions of the standard take-up sprocket are given in Chart 6. Intermittent and feed sprockets The intermittent and feed sprockets should be designed to have the same pitch as the perforations on newly processed film which is 0.13% less than the pitch of newly cut and perforated film (see Charts 1 and 2). The dimensions of the standard intermittent and feed sprockets are computed to conform to these requirements. The essential dimensions are : Base diameter 0.9452 inch (24.01 mm.). Tooth thickness (at base) 0.050 inch (1.26 mm.). Other dimensions of the standard