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LENTICULAR DISCLOSURES 243
the gate of both the camera and the projector in the shape of a curve (Eng. P. 318040). The great loss of light occasioned by the use of gelatin or glass niters was minimized by the I.G. by the use of direct-vision prisms in front of the gate of the projection machine (Eng. P. 383795). This could be kept in constant motion (Eng. P. 446282 and 447490). Instead of prisms, it was suggested that gas-discharge lamps be used. Three are needed, and they are so positioned in the projector lamphouse that their images fill completely the areas that would be occupied by the filters (Eng.. P. 419701). Projectors use lamps that give out great heat which may affect not only the film, but also the filters. The use of gas-discharge lamps reduces the heat tremendously. The colors so formed can be controlled by physical means to conform to the
FIG. 82
three primaries, and the intensities would be much greater than those produced by means of a single light source behind gelatin filters. As far as the projection lens is concerned, it would see only three bright colored areas in the position that would ordinarily be occupied by a set of banded filters. These also would be seen by the projection lens as three colored areas, so the one system is identical to the other. The question of heat was solved by Opticolor by inserting a cooling coil in the lens and filter areas (Eng. P. 432401). The projection of a film positive is usually carried out by means of lenses whose optical characteristics are different from those of the taking lenses. This creates quite a few optical problems. In order to recreate the original scene, the light that passes through any given dot in the film must be directed to the same filter that the original beam passed through in giving rise to this dot image. The exact conditions that must be fulfilled by projection lenses are described by I. Kitroser (Fr. P. 537508). Expressed briefly, these are that the filter, when viewed from any single lenticule, must subtend the same angle in the projection system that it subtended in the taking system. A somewhat more detailed discussion is contained in a disclosure by A. Averan and I. Kitroser (Eng. P. 308320).