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tographv, and all the attempts made so far, which the author of this article has been able to follow, have failed.
In any case, even admitting that a mosaic film may finally oe obtained, if it implies the process of inversion in order to transform the negative into a positive, it would be available only for amateur cinematography. And in this case too, and apart from the great difficulties of producing anyhow an even mosaic upon a celluloid film without incurring an excessive expenditure, there would always remain the very serious disadvantage of having to increase the light in the projector, given the great absorption of light by the mosaic; damage to the film would be the unavoidable result.
In 1928 the Kodak Company of Rochester elaborated a process of Colour cinematography for amateurs, which is based upon the principle discovered many years ago by Lippmann, the great physicist, and styled by him « integral photography ». In this system lenticular elements come into play, which are founded in the « gaufrre » celluloid film, as it was called by the Frenchman Keller Dorian, who was the first to employ in practice, to a certain extent, the principle discovered by Lippmann.
The Kodak lenticular film, with a coating of panchromatic emulsion and used with a special trichromatic filter, splits up the image into its coloured elementary constituents, which are subsequently reconstructed during the projection of the film, showing the positive image obtained by inversion.
This process has already been applied in the United States of America, and those journalists who have had occasion to see the results obtained, have spoken of it with great admiration. In Europe, however, this system has not yet been introduced. As also here it is a case of a positive image, the reproduction of which appears to be very difficult, it is not likely that this process can be applied to ordinary cinematography.
Three-colour photography.
All processes of colour photography, including the autochromatic system, apply what is known as the three-colour principle,
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