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460 F. P. HERRNFELD April
nation along the platen length is within =fc3%. This uniformity was verified by film exposures.
The camera film to be tested is held between two rewinds. It is threaded through a viewing box, over the film platen and to a take-up. The viewing box is located to the left of the film platen, with light shields to permit darkroom operation. The primary function of the viewing box is to frame the camera original with the color correction filters in the platen. Sprockets, rollers and weighted rollers are arranged in such a manner as to allow easy threading in the darkroom with a minimum of danger to the camera film.
The printing film is mounted on a manually operated carriage which accommodates 400 ft of Ansco Color printing film raw stock (see Fig. 5) . The spindles holding the film are made to take either negative or positive plastic film cores. The film is fed from the unexposed roll over a film sprocket, under a curved pressure plate, over another film sprocket, and onto the take-up spool. The two film sprockets are coupled by a chain-and-sprocket arrangement to assure a constant loop under the pressure plate. When the carriage is moved down into the exposure position, i.e., at the point of contact between camera and printing film, a microswitch starts the exposure cycle. This cycle is completely automatic and has safety features preventing the exposure of less than a full platen, as well as double exposures. A contactor in series with the fire shutter also prevents accidental fogging of the film due to too early release of the carriage.
As the camera and the printing film are engaged over an arc, it is necessary to move the printing film vertically away from the camera film until the loop of printing film has cleared the camera film by at least % in. before the raw stock is advanced. Only after all physical contact between camera and printing film has ceased, will the automatic transfer of the printing film start. At each upward stroke of the raw stock carriage, at least 20 frames of printing film are transported onto the take-up spool. At the completion of the upward stroke, a contactor automatically resets the instrument for the next exposure cycle. If the upward stroke is not completed the fire shutter will not open upon contact of the printing and camera film.
CORRELATION BETWEEN PRINTER AND SCENETESTER
In adjusting the Scenetester for the proper light and color temperature to match the color printer, a color temperature meter of the comparative type is an invaluable aid (see Fig. 6) . A meter built for this