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American Standard
A and B Windings of 16mm Film, Perforated One Edge
Keg. V.S. Pal. Off.
PH22.75-1953
•UDC 778.5
Winding A Emulsion side in
Winding B Emulsion side in
(With the types of winding described below, the emulsion side of the film shall face the center of the roll.)
1. Scope
1.1 The purpose of this standard is to insure a uniform method of designating the type of winding (the location of the perforated edge) when ordering or describing 16mm raw-stock film with the perforations along one edge.
2. Film on Cores for Darkroom Loading
2.1 When a roll of 16mm raw stock, perforated along one edge, is held so that the outside end of the film leaves the roll at the top and toward the right, winding A shall have the perforations along the edge of the film toward the observer, and winding B shall
have the perforations along the edge away from the observer. No preference for either type of winding is implied, since both types are required for use on existing equipment.
3. Film on Spools for Daylight Loading
3.1 When the film is wound on a spool with a square hole in one flange and a round hole in the other flange, it shall be specified as winding B when wound as described for B above and with the square hole on the side away from the observer. Windings other than winding B, on spools, are considered as special-order products.
Appendix
(This Appendix is not a part of American Standard A and B Windings of 16mm Film, Perforated One Edge, PH22.75-1953.)
Al. The types of winding covered by this standard are limited to those which are in general use.
A2. It is recognized that film on spools, with a
square hole in one flange and a round hole in the other, can be wound in other ways than that described as winding B, and that for special purposes these windings may be supplied commercially.
Approved December 17, 1953, by the American Standards Association, Incorporated Sponsor: Society of Motion Picture and Television Engineers
•fimcrsal Decimal Clarification
Copyright 1954 hv the American Standards A«»ociation. Incorporated 70 East Forty.fifth Street. New York 17, N. Y.
Printed in U.S.A. \S \H-M2S4
Price. 25 Cent
174
February 1954 Journal of the SMPTE Vol. 62