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the two surfaces of the film is a difficult matter, and when this is imperfect the images appear encircled with red and green rims.
Then again, the film, which is coated with emulsion on both sides, gets easily scratched and the dyes rapidly alter under the influence of the electric arc. Lastly, the cost price of such films is about double the ordinary cost.
3. The Gaumont Process with Multiple Objectives.
This process is based on three positives obtained from three selected negatives made through three corresponding coloured screens, the superposition of these three images producing a polychromatic reproduction. This system, while reproducing inanimate objects most faithfully, leaves much to be desired in cinematography. The distance between the three objectives, in fact, however slight this may be, impedes the accurate superposition of the three images, and one is further compelled to use objectives mounted on rollers for the purposes of projection so as to correct this defect, which tends to produce coloured rims to the images.
As this correction has constantly to be made, is has been found necessary to instal in front of the screen a cabin from which an operator regulates the objectives electrically by means of a series of levers, thus correcting discrepancies in superposition.
Wider use has not been made of this process up to the present on account of these defects.
4. AUDIBERT AND ThOVERT PROCESS, BASED ON MULTIPLE OBJECTIVES AND WITH REDUCED STEREOSCOPIC EFFECT.
These inventors have done much to reduce the defects of the Gaumont system by sensibly diminishing the effect of parallax through the use of a divergent lens in front of the multiple objective, in such wise that one practically obtains a photograph of the virtual image corresponding to the anterior system.
The depth of this first image not being very pronounced,
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