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

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(a) Width 1.375 inch 1.102 inch (b) Width between centers of sprocket holes 1.109 U2 .874 " (c) Number of sprocket holes per foot of film 643 61 " (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 " .087 " Distance between cords 073 "4 .063 " Safety Standard F/lm Adopted bySoc. Mot. Ffclngs. April 19/6 uoz" -.674' -+V— -A 1 ) .063 .748-* Stat/dard Filat Adopted by Soc. Mot Pic. En^s. Ja/y/9/7 t.375 Y U09" -j CD CD cb -4 jCD c^ | cd CD 1 CD CD \cp -~c\ y l$\ Jj* b .L J073 \-.9060" + i 2 The Incorporated Association of Kinematograph Manufacturers (London) has adopted as standard 1 . 110 inch for this dimension. 3 The English standard is 64 holes for each 11 15/16 of film length. 4 The English standard is .072 inch. 185