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Proposed American Standard
A and B Windings of 16mm SinglePerforated Film
(Third Draft)
PH22.75
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
Winding A Emulsion side in
Film on Cores for Darkroom Loading
When a roll of 16mm raw stock perforated albng 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.
Film on Spools for Daylight Loading
When the film is wound on a spool with a square hole in one flange and a round hole
film with the perforations along one edge.
With the types of winding described below, the emulsion side of the film shall face the center of the roll.
Winding B Emulsion side in
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 the Proposed American Standard for A and B Windings of 16mm Single-Perforated Film.) The types of winding covered by this standard are limited to those which are in general use.
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.
NOT APPROVED
February 1953 Journal of the SMPTE VoL 60
189