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1948 SAFETY FILM SUPPORT 349
4. Laboratory tests on negative film have been carried out, which indicate probable satisfactory behavior. Low shrinkage character; istics of the high-acetyl acetate base offer the possibility of improved i printing characteristics under proper conditions.
ACKNOWLEDGMENT
The author wishes to express his appreciation for the assistance and
I helpful suggestions received from many members of the Department
of Manufacturing Experiments of the Eastman Kodak Company in
the preparation of this paper.
REFERENCES
(1) J. M. Calhoun, "The physical properties and dimensional behavior of motion picture film," J. Soc. Mot. Pict. Eng., vol. 43, pp. 227-267; October, 1944.
(2) C. J. Malm, C. R. Fordyce, and H. A. Tanner, "Properties of cellulose esters of acetic, propionic, and butyric acids," Ind. Eng. Ghent., vol. 34, p. 430; April, 1942.
(3) J. R. Hill and C. G. Weber, "Stability of motion picture films as determined by accelerated aging," Research Paper RP 950, Jour. Res. Nat. Bur. Stand., vol. 17, p. 871; December, 1936.
(4) E. K. Carver, R. H. Talbot, and H. A. Loomis, "Effect of high-intensity arcs upon 35-mm film projection," J. Soc. Mot. Pict. Eng., vol. 41, pp. 69-88; July, 1943.
(5) R. H. Talbot, "Some relationships between the physical properties and the behavior of motion picture film," J. Soc. Mot. Pict. Eng., vol. 45, pp. 209-218; September, 1945.
(6) J. Crabtree, "Sound film printing," /. Soc. Mot. Pict. Eng., vol. 21, pp. 294323; October, 1933.
DISCUSSION
CHAIRMAN W. V. WOLFE: Dr. Fordyce, I understand that your company is now putting out a universal film cement which is good for the old acetate and the new safety-base film. Is that correct, and do I also understand that you are no longer making available the old nitrate-base film cement?
DR. CHARLES R. FORDYCE: The first part of that statement is correct. We are putting out a film cement which we call Universal Cement for all types of film. I think I am right in stating that you are also correct in the second statement that we no longer supply the other, but I might be wrong.
CHAIRMAN WOLFE: I particularly ask that question because there has been some comment about the possibility that the Universal Cement was not so good for a nitrate-base film as the old nitrate film cement.
DR. FORDYCE: Yes, that is a question. Of course, as you know, in testing film cements, it is quite difficult to get more than two people to test them in the same way, and I do not really know what a majority opinion would be on the basis of these two cements. We like the newer cement in the tests we have run, and in our use, but maybe some of the trade would rather have the other cement.