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MAKING A FADEOUT BY AFTER TREATMENT 45
A device described in a previous communication (2) may be used for the purpose because it can be adapted very easily to control the motion in any manner described. This device is illustrated schematically in Figure 7 with some of the other equipment which might be used for handling the film. The timing element proper consists of a tape moved at a constant rate under a set of small levers. Perforations made in the tape at the necessary points move the levers, making electrical contacts by which the film advancement ratchet can be moved, motors started, stopped, reversed, etc.
There are other devices commercially available for timing a predetermined sequence of events such as the blowing of time whistles, ringing bells, etc., which might be adapted to this purpose. As mentioned above, there is always the possibility that an approximation of the motion required which is much more readily attained will be equally satisfactory in practice.
In the construction of apparatus for the treatments described in this paper it is necessary to take into account the corrosive nature of the solutions when deciding upon the material to be used in contact with the bath or the wet film (3).
References
(1) Crabt-ee, J. L.. and M-'eb'e'-. L. F . • Intensification and Reduction of Motion Picture Film, J. Soc. Mot. Pict. Eng.. 193 1. To be published.
(2) Jones, L. A.: A New Non-Intermittent Scnsito meter, J. Frank Inst. 189: 303. Nov. 3. 19 20.
(3) Crabtree. J. I., Matthews, G. E., and Ross, J. F.: Materials for the Construction of Motion Picture Processing Apparatus. J. Soc. Mot. Pict. Eng. 16: 330 — 3 40, March, 1931.