Report of the Standards and Nomenclature Committee: September, 1927

At the Norfolk meeting of the Society the sprocket dimensions in accordance with the general plan of Mr. J. G. Jones had first approval as follows: — 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 with films in commerically useful condition as supplied by exchanges. — The feed and intermittent sprockets are to have a pitch equal to that of the sprocket holes in newly finished film. — The Committee finds that, the maximum shrinkage of useful film is 1.5% and recommends a take-up sprocket designed accordingly. The shrinkage of newly processed film, for which the feed and intermittent are designed, is 0.13%. These latter sprockets, as has already been shown, will accommodate film shrunk as much as 2.92% without damage. Dimensions of sprockets to produce these results are illustrated in Charts A, B, and C. (pp. 407. 408 in No. 29 Transactions.)

Print ISSN
Published
1927-09
Content type
Original Research
DOI
10.5594/J06588