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282
CRABTREE, SANDVIK, AND IVES
[J. S. M. P. E.
intervals to insure that it was working properly and that the pressure shoes and other parts were in correct adjustment. After ten projections each sample was remeasured. After ten runs, the samples were divided into groups for further treatment, as indicated in Table III.
TABLE III Treatment of Various Samples after Ten Runs
Sample
Treatment
91
Wiped with clean plush
92
94
•
96
QC
100
Cleaned on the cleaning machine with carbon tetrachloride
106
110
112
93
95
Q7
QQ
Cleaned on the cleaning machine with carbon tetrachloride and
101*
the original treatment repeated with each sample
107
111
102
No treatment
103
* This sample was not cleaned but merely bathed with the original treating solution.
The Cleaning Operation. — Cleaning of the test samples was carried out with a slightly modified cleaning machine described previously.3 The modification consists in the use of two tanks of cleaning solution instead of one. The film passes from the feed reel with the emulsion face downward into the first tank A, Fig. 2, under an idler roller and over the plush covered roller P, then under a second idler, and then out of this tank. The plush covered roller is driven by the film and is partially immersed in the cleaning liquid. As it revolves at a very high speed it throws a shower of solvent against the film. Also the pressure between the film and the roller wrings the liquid out of the cloth and forces it along the film surface. In this way a very gentle
3 CRABTREE, J. I., AND CARLTON, H. C.: "Cleaning Liquids for Motion Picture Film," Trans. Soc. Mot. Pict. Eng., 11, No. 30 (1927), p. 277.