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Dec, 1936-jan., 1937 The Joiir)ial of the Associaiion of Cine-Technicians
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ensure that films, whether for daily rushes, re-recording, or release, are a close replica of the original negative.
Ultra Violet Exposures.
With recordings made on a magnetic drive recorder employing the latest amplifying equipment and light modulating units, and playing the record over a good
F16 9
reproducing apparatus embodying a rotary stabiliser soundhead there still remained distortions introduced into the upper frequency area which became serious under certain conditions of treatment.
This problem resolved itself down to a means of obtaining improved resolution of the film and better definition of the images presented by the lens system.
Since the emulsion thickness of sound-recording film is about O'OOS" and is made of a white diffusing material, it is impossible to restrict the light within the emulsion to the thickness of the beam. This is clearly shewn in Figure 9, which is a cross section of a film and the recording light beam.
•After entering the top layer of emulsion the light is immediately scattered, so exposing adjacent silver deposits outside the thickness of the beam. Further, as the light penetrates the emulsion its intensity is decreased by
FIG.IO
ANGSTROM^..
absorption, but it is of sufficient actinic value by the time it reaches the celluloid base to permit reflections to expose the lower side of the emulsion. Such a condition gives rise to an ill-defined trace.
It has been proved that all this can be completely eliminated by restricting the light exposures to a small band of frequencies which are strongly absorbed by the emulsion,
S.A.P.!
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