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17o Vol. 16, No. 6
STEREOSCOPY IN THE TELEKINEMA AND IN THE FUTURE
Leslie P. Dudley, D.F.H., A.M.I.E.E., A.R.Ae.S., F.R.S.A.*
BEFORE discussing the actual apparatus used for production and projection of the stereoscopic films being shown at the Telekinema, it will no doubt be of interest to examine briefly the considerations which resulted in the adoption of the system concerned in preference to certain alternatives.
A NEW POLYCHROMATIC
ANAGLYPHIC PROCESS
Synchronous eclipse and monochromatic anaglyphic processes must be regarded as
Fig.
/. Polychromatic Anaglyphic Attachment fitted to Bell and Howell FUmo.
impractical in the case of the former and obsolescent in the case of the latter.1 Consequently, no consideration was given to of these categories. A new polychromatic anaglyphic process is available, however, which represents a considerable advance on earlier processes of similar type. It is not proposed to describe the process here, full details being available in the author's British Patent No. 634,890. The chief merit of the system lies in its extreme simplicity. The special stereo attach
ment used is fitted externally to any camera, and standard monopack colour stock is employed. A typical attachment is shown in Fig. 1.
Processing is carried out in accordance with the normal procedure for the stock concerned. As a result, the image produced in each frame of the film is in the form of a polychromatic anaglyph occupying the full area of the frame. The projected images are seen both stereoscopically and in colour when viewed through the appropriate anaglyphic spectacles. Any existing projector, without the addition of any special filters or other devices, may be used. The colour reproduction, however, is slightly less perfect than that obtainable with the same stock exposed in the normal manner. For this reason it was decided, after consideration, not to employ the process for the Festival stereoscopic films.
AUTO-STEREOSCOPY
. Stereoptics, Ltd., were also asked whether it would be possible to provide an autostereoscopic system, and, as was stated at the time, the provision of a system of this type would have been technically practicable. Serious consideration of the proposal was, however, out of the question owing to the short time available in which to produce the equipment and to the very considerable expenditure which would have been entailed in production of the necessary special screen and other apparatus.
The author ventures, nevertheless, to express his personal opinion that expenditure in this direction might well have proved an investment yielding a handsome dividend to the British film industry. The cost involved would, in any case, have been comparatively small when considered in relation to the sums expended on certain other Festival projects which are unlikely to result in any permanent benefit to industry.
• Technical Director, Stereoptics, Ltd.