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154 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
tract also, which should give a snappier print at that point as well as the picture image.
It is needless to say that we have had very little experience in the technique of sound printing, not being in the producing and processing of sound pictures, and it is needless to say that we have had very little assistance up to the present time, in so far as knowing what to give the trade is concerned. The writer visited several laboratories last fall but was unable to see a single printer arranged for sound printing or to gain any information as to how it was done or what was wanted. In fact, in the only instance where a machine was even visible, it was immediatel}^ covered before the writer got within fifty feet of the apparatus. Therefore, we have had to work along on the information which we have gathered from time to time, especially from articles contributed to the Society of Motion Picture Engineers Conventions and the various camera publications and our own knowledge in general as to how a printer should be constructed for doing ordinary printing. The sound part we have had to take more or less on chance. Possibly, no one was more surprised than ourselves when our very first sound picture began to talk to us, and ay it seemed to have a fairly clear voice and the quality of the picture was not unpleasing, we have ventured to present this machine and this article to this learned body of men with apologies and the hope that you have not been bored by this lengthy paper.
I shall be glad to undertake to answer as best I can the questions which may arise in your minds regarding this machine.
DISCUSSION
Mr. Crabtree: For what negative shrinkage is the printer sprocket designed ? Also, if you run a piece of positive film over the film sprocket without a negative, is the density obtained uniform or is there non-uniformity due to the fact that you don't have a mechanical filter between the driving mechanism and the sound sprocket?
Mr. DePue : It drives directly from the sound sprocket. There is a worm driven sprocket here, and the gear is not necessary; it goes straight on to the sprocket, so that this wheel (indicating) gets the least possible motion, and from there we drive this mechanism. We don 't have any gears or belts.
Mr. Crabtree : Have you made a test to determine the uniformity of the motion of the sprocket?