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A Printer for Simultaneo^is Printing — De Pue 153
allow the printing to be completed in one operation through the machine. We are also of the opinion that where the picture and the sound tract both appear on a single negative this machine will still be able to handle the print in one operation, by merely allowing a sufficient loop between the picture aperture and the sound aperture, which should place the sound print at its proper distance from the picture print on the finished positive. There may be one technical difficulty in this operation and that will be the handling of the light control for the sound tract. Of course, there will be a notch for each picture change, and this notch will have to be accounted for on the automatic light control of the sound tract. This may be accomplished by merely allowing the light change to take place on the same light, whatever that may be set up for, and varied at the points where variation is necessary, or it may be that notches on the opposite side of the film can be employed for this second light control so that there will be no connection between these two light changes, excepting that each negative will have its own notchings for this purpose. Avoiding the necessity of rewinding the positive print and the time saved in the second threading operation should add considerably to the volume of film which can be printed in a day's time.
There is one other point which we have tried to cover in the construction of this machine and that is, at the point of contact, at the aperture, we have recessed the pressure plate a very few thousandths of an inch and blackened that surface so that there will be no back lighting from a reflecting surface thru the positive film. The fact that all cameras have a blackened backing for exposure to light is so well known that it has seemed strange to us that this fact has not been taken advantage of in printing, but it is a well known fact that, up to the present time, all continuous printers have been made with a highly polished steel pressure plate which, of course, reflects a certain amount of light, which in turn, softens down the finished print ; and this effect is probably what has caused many critics to favor a step printer, which of course, has no reflecting surface, and as a result, the finished product appears to be snappier and of better quality. We think, however, that a direct comparison of prints made on our machine and a step printer will reveal the fact that this darkened surface adds greatly to the snappiness and quality of the finished product. We have employed this same device for the sound