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THE CONTINUOUS REDUCTION PRINTER
' By Alexander F. Victor
Following the introduction and adoption of the Safety Standard film, the next logical step of progression was the creation of a _supply of this film, adequate to the needs of the field it is to safeguard.
The most immediate and richest source of film subjects would naturally be the thousands of standard negatives already in existence.
Only one bit of apparatus was required to bring this treasuretrove into the immediate service of the home, school and church. A satisfactory reduction printer was the essential thing.
The existing reduction printers, while producing results of excellent quality, lacked the speed for quantity production, which is certain to be required in the enlarged field of Safety Standard Film.
Most of you are familiar with the step reduction printer, whereby the negative and positive film are moved step by step — the movements of the two being perfectly synchronized. The two films are some distance apart — a lens interpolated, and a light source back of the negative. A shutter masks the light exposure during the movement of the film. Owing to the reversing action of the lens, the two film strips must move in opposite direction. With the most accurate workmanship, it is impossible to operate two intermittent movements at a high rate of speed, without causing a certain amount of vibration. Obviously the step reduction process must be less speedy than a continuous method of printing.
So my ambition reached out toward the creation of a Continuous Reduction Printer. To realize this desire, all that appeared necessary would be to move the two film strips in opposite directions at an absolutely constant but dissimilar speed. Thereby the intermittent movement and the shutter would be eliminated.
Complicating my work was the fact that the two film strips are located at least ten inches apart, and would involve not less than three flawless gears. Gears so perfect that a combined error of a thousandth of an inch would render the scheme worthless.
After several futile experiments, I reached this simple solution of my problem. Since the action of the lens, in reversing the image, necessitated the movement of the film strips in opposite directions, it must logically follow that a second reversal of the image on the positive would permit the travel of the two trips in the same direction.
To accomplish the second reversal of the image I used an internal reflecting prism. In addition to a second reversing of the image, this prism performs another essential service.
I will explain.
If you will refer to illustration you will note that the special sprocket (A) is provided with two sets of teeth.
The positive film travels over the small drum, between the teeth
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