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The motion pictures of the cinema eliminate this defect and render possible an analysis of complicated processes. For the above reasons, color cinematography ranks first in the field, also here, although it has not been possible to make an extended use of it, because the various processes which it includes, that is to say, the cumulative synthesis, are obstructed by numerous difficulties. Among these are the diminished luminous sensibility, the outlines which exhibit exaggerated or decomposed coloring, the complicated apparatus.
The « Emil Busch » Co. of Rathenow in Germany has succeeded in creating a process of colored cinematography for medical instruction which is free from all these defects and which has been used for over a year with satisfactory results in the surgical clinics of the Universities of Berlin and Marburg.
This process also is based on the cumulative principle, that is to say, with the auxiliary of philtres, colored respectively in blue-green and orange-red, by means of which two partial negative visuals are obtained differing only in tone.
On printing such negatives the positives are obtained for projection on the screen by means of two objectives; the colored films in green-blue and red-orange produce one red and one green image which unite. Thus one single image is formed of approximately natural tints, and fully meets many practical requirements and above all those of medicine.
The two-color system, however, does not reproduce the chromatic nuances as perfectly as a multi-colored process ; yet it is adeguate for the reproduction of the red orange and the green -blue, with parts in black and in white, and also for white, grey, black, light grey-blue, and dark blue.
In contrast to the multi-colored system, this method has the advantage of a simple technical application and therefore of greater economy, especially as a normal film ribbon is used for taking the photograph and for the projection.
Figure one shows a Busch Color film and a normal film, and demonstrates how the partial images of the color film when united have the size of the normal cinematographic image, and that
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