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280
CRABTREE, SANDVIK, AND IVES
[J. S. M. P. E.
about four feet, and with five feet of travel in the open air, the machine could be operated at a speed of fifty feet of film per minute.
With the applicator blades traveling at one-third this speed, the quantity of solid wax applied amounts to only about 0.10 gram per 1000 feet of film. Projection tests with such lubricated films showed that the wax 'did not encroach on the sound track nor did it tend to accumulate in the aperture of the reproducer mechanism, thus fulfilling requirement No. 1 outlined on page 275.
II. SURFACE TREATMENT TO RETARD ACCUMULATION OF GROUND NOISE
In order to determine the type of material that appeared most promising from the standpoint of surface protection, several groups of materials were selected differing widely in their physical properties. These can be classified as materials which when applied in thin layers to the film emulsion formed a hard surface, such as various types of lacquers, or a smooth and more or less plastic surface such as is given
TABLE II Treatment Accorded Film Samples
Sample
Treatment
91
Surface waxed with 1.0% cantol wax in carbon tetrachloride,
92
buffed, and edge-waxed with a solution of paraffin in carbon
93
tetrachloride
102
94
Buffed and edge-waxed with 1.0% solution of paraffin in carbon
95
tetrachloride
96 97
Edge waxed in 1.0% solution of paraffin in carbon tetrachloride
100
Cantol surface waxed with 0.25% cantol wax in carbon tetra
101
chloride
103
Plain film
106
Oiled with a 2.0% solution of light motor oil in carbon tetra
107
chloride and buffed
110 111
Treated with special lubricant containing 0.9% paraffin wax
112
and 0.5% light motor oil dissolved in carbon tetrachloride
by various types of waxes and oils. Experiments were also made on hardening the surface by treating it with formalin solutions. The ground noise of these samples was then measured in a manner similar to that described in an earlier communication. l After measurement, the samples were cinched by winding the film into a loose roll and