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Report of Standards and Nomenclature Committee 43
Dr. Mackenzie: I am very much in favor of putting in anything which Avill avoid ambiguity.
Mr. Edwards: In making provision for a 100 mil track is it necessary that the Avidth between the outer edge and the sprocket hole is only 4 mils? The average theatre finds with that edge of the sound track only 4 mils — our experience shows that the edge of the sprocket hole is fractured and leads into track and the music cuts in on the picture. If there is not some other good reason why can't we have 17 mils clearance on the inside and only 4 on the outside where the source of damage is more prevalent.
Dr. Mackenzie: The 4 mils on the outside w^as to avoid danger of light striking the sprocket teeth and being reflected and giving a sound of frequency 96 cycles from the perforation. The 17 mils on the other side was what was left over after the present practice of projectors and printers was considered. We know of no reason for recording this 17 as sacred. Considering the practice and the pictures as produced, w^e thought this the most judicious use of the space if you print on the left side of the 35 mm. film.
Mr. Edwards: I don't think Dr. MacKenzie quite understood my object. I can't see why instead of having 4 thousandths clearance between the edge and the sprocket hole the track couldn't be moved over, because you have an adjustment for the scanning slit that w^ould permit it.
Dr. Mackenzie : There is an adjustment for the scanning slit located so that it is 54-55 mils from the inside line of the perforations.
Mr. Edwards : In my Movietone I can move it off the track.
Dr. Mackenzie : Those in the theatres are not that way.
Mr. Edwards: I can bring m}^ sprocket to make any adjustment on the track ; this is standard Movietone apparatus. When the engineers first put it in, they made a mistake and we centered the track and had no further trouble.
Dr. Mackenzie: I should like to see that. Unless I was misinformed, the standard machine is not expected to be so adjusted.
Mr. Crabtree: I see another objection to this small separation between the sound track and the edge of the perforation. During development you can get a flow of developer through the perforations and when developing to low gammas you would be apt