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1950 MULTILAYER STRIPPING 447
On February 6, 1941, exposures of a resolving-power chart were made in a Mitchell camera on such a two-layer film. The stripping was done before development on a simple machine on which the strippable emulsion layer was transferred onto a special transfer film bearing a suitable substratum. There was no pretense at maintaining registry between the two images, which, of course, must be accomplished for motion picture making. Figure 2 shows actual samples of these first negatives.
The technique of stripping was simple. The two-layer film was wetted in plain water, temperature approximately 70 F, for about 10 sec, and while under water was brought in contact with the transfer film; then the two films were rolled into intimate contact between two rubber-covered rollers. The "sandwich" was then allowed to remain for about a minute in order that the emulsion layer about to be stripped could bond to the transfer film. The actual stripping operation was performed over two rollers. After drying the film, development was performed in the conventional way.
About this time a blue-sensitive emulsion, bearing on its surface a yellow filter layer, was coated on a separate film. This made bipack experiments possible. Quite a bit of this bipack work was done on 4 x 5 in. and 5 x 7 in. sheet film, the bipack being exposed in a camera having a sheet of plain glass in the film holder. Some useful experiments were carried out in this way insofar as the emulsion properties were concerned, but the scheme was soon abandoned as far as serious picture making might go, because of the many defects in the negatives, such as Newton rings, dirt and halation.
Soon after this, a crude 35-mm machine was assembled which permitted stripping some film in which the perforations of the two-layer film were held in precise registry with the transfer film during the bonding period.
Color prints from these two negatives were made on a contact registering printer. The prints were found to be in good registry and no signs of distortion of the stripped emulsion layer were evident.
After this encouragement, a three-color multilayer film was attempted, but it was not until July 29, 1942, that a successful threecolor coating was available for camera tests. The over-all thickness of this multilayer film was approximately the same as a black-andwhite motion picture negative film. The sensitometric characteristics were excellent, all three emulsion layers having an exposure lati