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292 TALBOT
III. TREATMENT OF FILMS FOR USE ON REPEATER MECHANISMS
Considerable attention has been given to the surface treatment of films intended for use on repeater mechanisms. Several types of these have been studied — some to a considerable extent. In one instance, a film of approximately 400 feet in length was prepared as an instructional aid for the manufacturer's service organization.
In the course of these investigations many types of surface treatments were studied, including several well-known products. Many of these film-treating processes which offered some degree of protection against film failure upon normal projection were found to be inadequate for repeater-projection operation. It has been found that the simple carbon tetrachloride-carnauba wax treatment of both surfaces of the film gives excellent film performance on all types of repeaters, and this treatment has been the standard in the investigations by which all other treatments are judged.
Substantially flat film is also a prerequisite for good film performance on repeater mechanisms. Film can be made to remain flat by proper control of the relative humidity. No surface treatment can assure successful film performance on repeaters unless the film is maintained essentially flat.
ACKNOWLEDGMENTS
The film-friction recorder described in this paper was developed by Mr. E. Seymour, of the Development Department, at the Camera Works of the Eastman Kodak Company, and has been used for some time by Mr. John T. Parker, of the Department of Manufacturing Experiments, at Kodak Park Works, for studying film friction in cameras and projector gates.
The author wishes to express his sincere appreciation to Dr. C. R. Fordyce, for his helpful suggestions and for continued guidance in the preparation of the paper, and to his colleague, Mr. Thomas J. McCleary, who aided materially in the assembly of the data presented.
REFERENCES
(1) J. I. Crabtree and C. E. Ives, "The lubrication of motion picture film." Trans. Soc. Mot. Pict. Eng., vol. 11, pp. 522-541; Number 31, 1927.
(2) J. I. Crabtree, Otto" Sandvik, and C. E. Ives, "The surface treatment of sound film," /. Soc. Mot. Pict. Eng., vol. 14, pp. 275-290; March, 1930.
(3) "Ethyl Cellulose, Properties and Uses," Hercules Powder Company, Wilmington, Delaware, 1944.
(4) H. Bennett, "Commercial Waxes, Natural and Synthetic," Chemical Publishing Company, Inc., Brooklyn, New York, 1944.