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on the film, which images differ only in tone, after the luminous rays have passed through the reflecting superficies S2, S3, S4 into the prisms installed behind the objectives. As the design plainly shows, there is an equal distance, not only behind, but in front of the objectives ; the result is a perfect identity of size of the partial images, no matter whether they represent distant or near objects. Moreover, the system of the division of the luminous rays produces figures taken contemporaneously and rendering the most rapid movements without incurring variations of position. The system is therefore absolutely free from the defects of parallax in time and space, thus avoiding the colored outlines so often deplored in other systems.
It possesses another very remarkable advantage, inasmuch as it can be used simultaneousely as finder, thus making it possible to observe the object while filming it, to choose the most favorable view, and to regulate the focus at any moment. This is done by means of the reflecting surface S3 which does not reflect all the light for the production of the red figure bl, but transmits directly one fifth onto the opaque plate m, thereby forming the image b3, only faintly luminous though sufficiently so for observation. This image is adjusted by the adjustment 03, so that the eye sees the image b4 through the lens ok.
The system of projection makes use of one of the ordinary curved reflecting lamps. Behind the gate there is a double system of prisms for adjusting purposes ; this receives the rays from the partial images, directing them by divers axes to the two projection objectives.
The greater distance between the axes permits the use of very luminous objectives which is a detail of the greatest importance in color projection, demanding naturally more light than black and white projections. With the help of the philtres, the objectives project on the screen one red and one green image which, by regulating the objectives, come exactly one above the other.
The whole apparatus consists of the camera, the illuminant (constructed in two different models) and the color apparatus, which is attachable to the cinematograph projector.
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