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REPRODUCTION OF COLOR FILM SOUND RECORDS
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For a study of the question of whether these two phenomena are connected, and what is their cause, we have made some experiments which will now be reported. First, however, we shall briefly mention previous publications on the question of the reproduction of colored sound tracks.
The question of colored sound tracks has been discussed for a long time in connection with earlier 2-color films. These films used positive stock coated on both sides with emulsion layers that were toned in complementary colors, and the question arose on which side the sound track should be printed. Otis1 found that this question cannot be answered in a general way, but that it was important to know the spectral sensitivity of the photoelectric cell used for reproduc-.
BOO 900 1000 myj
• CESIUM OXIDE CELL •-• CS Sb CELL
FIG. 1. Density of Agfacolor sound track as a function of wave length.
tion. He found, for example, that, if the sound track of the multicolor film is in the blue layer, the film is much better reproduced with a red-sensitive caesium cell than with a blue-sensitive potassium cell. The reason for this is that the light modulation of the blue-toned sound track runs between blue and white, and that blue light does not appear appreciably darker to a blue-sensitive cell than white light. To a red-sensitive cell, however, the blue parts of the track appear almost opaque.
Because of these considerations, it was proposed2 that each of the several colored layers could contain a different sound record, perhaps in different languages or covering different frequency ranges, etc., and anyone could be selected for reproduction by changing the photoelectric cell, or by using colored filters in connection with a cell sensitive to all colors. As interesting as this proposition was, it failed