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of the larger, which engage the negative strips. The teeth are cut on the same arbor, used for turning the sprocket itself.
Possibility of error is therefore reduced to the negligible quantity of imperfect arbors, machines or milling cutters.
Since the two strips are fed simultaneously and on the same shaft, they must necessarily advance at the exact speed ratio assigned to each.
However, I was confronted with the fact that this arrangement did not allow for the interpolation of a lens, if the two film strips were arranged parallel to each other.
The internal reflecting prism by deflecting the image 90 degrees permits this separation of the two film strips.
x\gain referring to the illustration. The aperture "B" permits illumination to penetrate the negative, forming an image on the positive at point "E," after passing through prism "C" and lens "D.''
The result is exactly that which would be obtained if the two strips were placed in actual contact, with the desired reduction feature added.
The aperture "B" may be narrowed or widened to obtain the proper exposure.
An alternative method of governing the exposure may be gained by controlling the brilliancy of the light source.
The prism "C" is slightly rotatable, allowing for the correction of faulty camera frame lines. This feature is a distinct innovation in continuous printers; even contact printers do not possess this advantage.
Another advantage possessed by the Continuous Reduction Printer is the fact that no feed sprockets are required. The single sprocket smoothly and evenly unreels the material from the reel direct.
A variation of the apparatus described, introduces a geneva type of intermittent movement which I use in printing titles. In making titles the positive film is fed forward step by step, while a stationary negative at aperture ''B" carries a single negative element which is duplicated the necessary number of times. A shutter is made to mask the light during the movement.
Needless to state, a negative film strip may be used in conjunction with this method and moved step by step with the positive. The apparatus thus becomes a new form of Step Printer.
Another variation of the Continuous Reduction Printer eliminates the reduction feature, applying the advantages of this type of printer to regular standard film.
In all its variations this apparatus is equipped with a suitable motor, with easily regulated speed control ; although if desirable the machine may be operated by hand.
I believe the Continuous Reduction Printer is possessed of many new and desirable qualities, which the engineers of the industry will welcome ; and it is a pleasure and an honor to first present it to the Society of Motion Picture Engineers.
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