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314 J. R. ALBURGER
In closing, recognition should be given to J. O. Baker of the RCA Laboratories at Camden for his assistance in the work; to Dr. Solomen of RCA for his counsel ; and to the management of the RCA Research and Engineering Department for carrying this work through its long period of incubation.
REFERENCE
1 CRABTREE, J. I., AND IVES, C. E.: "A Replenishing Solution for a Motion Picture Positive Film Developer," /. Soc. Mot. Pict. Eng., XV (Nov., 1930), p. 627.
2 BAKER, J. O., AND ROBINSON, D. H. : "Modulated High-Frequency Recording as a Means of Determining Conditions for Optimel Processing," /. Soc. Mot. Pict. Eng., XXX (Jan., 1938), p. 3.
DISCUSSION
MR. CRABTREE: Have you made tests with the same formula omitting the aluminum salt and simply buffering the solution with sodium bisulfite?
MR. ALBURGER: We have tried that combination. The properties were not much superior to those with ordinary carbonate but the characteristics were similar.
MR. CRABTREE: It is probable that the properties of this developer are peculiar to the formula type rather than to any specific effect of the aluminum ions. Admittedly, the presence of aluminum ions will tend to tan the gelatin but any developer which has sufficient salt content will permit development at 90 °F or higher.
MR. ALBURGER: We have been working on this problem for the last year and a half, and have endeavored to cover the situation as completely as possible. We have satisfied ourselves, at least, that the problem has been as stated.