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44 Transactions of SM.F.E., Vol. XIII, No. 37, 1929
to get a greater degree of development of that part of the sound track, adjacent to the perforations so that gamma would vary across the sound track.
Dr. Mackenzie: That involves an arrangement for widening the whole film, and the committee is not perpared to recommend wider film.
Mr. Crabtree : Under the existing conditions, the flow of developer through the perforations would be worse than the effect of the reaction products of development on the picture.
(An unrecorded remark)
Dr. Mackenzie: What you mean is the guide roller above the sprocket. If the roller is so adjusted that the film comes down vertically, then this diagram applies strictly. If there is a mistake in the adjustment, it will come down askew and adjustment will be closer to the drawing than it was before when the film travelled vertically past the scanning line.
Mr. Eoss: If we remember Dr. MacKenzie's paper correctly last fall, he stated that longitudinal lines, white or black, didn't affect the sound record. Why not reduce the width of the sound track, say .010'', making the space between the track and the holes .015"? Would the exposing of one side of the track and the photo-electric cell cause interference with proper reproducing?
Dr. Mackenzie: We thought it would be better located symmetrically. It is not absolutely necessary, but it is desirable to avoid the weave of the film. With a sound track this size there is little clearance on each side. If you had a black edge of the sound track coming to the edge of the scanning line, it would be cutting off the variation.
President Porter : Are you ready for the question f We are voting on the position of the sound track. Does someone make the motion to accept the recommendation ?
(Motion duly seconded and carried)
As I understand it, you skipped the third.
Mr. Jones : The scanning line for combined sound and picture shall be 14.5 inches below the picture gate.
President Porter : Any discussion ?
Mr. Taylor : I think that is another case where you are defining a relative location of the picture and sound on film. The picture exists on film in any position you put it, and I think a better choice of words could be made although I have no objection to 14.5 inches.