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296 PROPOSED AMERICAN STANDARDS September
base point, and to have it located with some precision. That is why the second paragraph of the standard specifies the shape of a distinguishing index mark for the camera and states the accuracy with which it shall be located with respect to the film plane.
The note suggests a way to indicate on a lens that the base point for its focusing scale is in the focal plane. Most lenses are engraved "Feet" or ' 'Inches" and there is usually room to add the words "From Film." Unfortunately there is no corresponding way to state this simply on metric lenses, in terms that will be clear to all the nationalities employing the metric system.
In the discussions by the committee, there has been no divergence of opinion on the location and identification of the base point. Several changes in the wording of the standard have been suggested, and some have been made, but they were merely to clarify the meaning and preclude misunderstanding of the terms.
Proposed American Standard Winding of 16-Mm Sound Film
While this is the first time the matter of winding 16-mm sound film has been proposed for adoption as an American Standard, it has been followed in practice by the film manufacturers for a number of years. In addition, in 1941 the SMPE recognized the method of designating the two types of winding by publishing an SMPE recommendation which was substantially the same as the recent proposal. The only difference is that two sentences of explanation have been added to the present draft in an effort to clarify the meaning.
It is believed this standard fills a recognized need for a uniform way of designating the direction of winding of 16-mm sound film. It is definitely not the intent of this standard to indicate any preferred choice in the direction of winding since existing equipment is designed to use both styles.