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Harry N. Marvin, Cross Examination. :*291
tion picture film, is the roll that went through the camera? A. Yes.
Q. After it came out of the camera, what was done to it? A. It was developed.
Q. And how was it developed? A. Well, it was developed by being passed through a series of chemical solutions and being dried.
Q. What was the purpose of passing it through the chemical solutions? I want you to give a brief description if you will be good enough to do so, of what happens to the film after it comes out of the camera. A. The film after it comes out of the camera is placed in a solution that fixes certain portions of the sensitized emulsion that have been exposed to the light, and the film is then put into another solution that dissolves out those portions that were not fixed by the previous process. The film is then washed in a neutralizing solution which checks further action of the chemicals, and is dried, the result of this fixing and washing out process being to make visible upon the film, the latent photographs made by the light.
Q. Then it comes out and is known as the negative? A. It is known as the negative.
Q. What is then done to the negative in order to produce the positive? A. The negative is passed through feeding devices engaging sprocket holes in the film, in contact with another similar strip of sensitized film, and light is allowed to pass through the negative on to the positive strip, making a facsimile series of latent photographs on the positive strip, which is then developed in a manner similar to that used in the development of the negative, the result being a facsimile motion picture strip known as a positive, on which the lights and shades of the negative are reversed.
Q. Can you use a film which you buy from Eastman indiscriminately for a negative film or positive film, or do you get two supplies from them, one for use as negative films, and one for use as positive films? A. Well, they can be used interchangeably, but in common practice it is not customary, because the film commonly used for making negatives must l>e of great quickness, and for making positives, a film having a less quick emulsion is somewhat preferable, so that it is com mon to use film of slightly different characteristics for negatives and positives.