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A compressed-air cylinder attached to the underwater housing, working on a demand valve, maintains an " internal pressure of 3 psi above the external pressure, irrespective of the depth to which the camera is submerged. Stabilizing fins allow the camera to be moved through the water smoothly. The camera and housing weigh about 100 Ib when out of the water. Great flexibility of operation is attained by using diving equipment with self-contained air supply for the operator. While propelling himself and the camera by means of swim fins attached to his feet, the cameraman, unaided, can maneuver the camera and operate aperture and focus controls. Smooth travel shots, following divers or native fish down to a depth of 80 ft, have been shown before the Society.16
35-Mrn Sound Recording
The year 1950 has seen noteworthy progress in the application of magnetic recording to motion picture production. The extent of the application has varied among the producers from cautious planning and preliminary experimentation, with the view of future conversion, to complete conversion to magnetic recording on all production and music recording work.
While many advantages with respect to quality of production, maintenance and operation of equipment, and conservation of film raw stock accrue from the use of magnetic recording, the over-all recording operation, from the original recording of dialogue and music to the production of the final release print, has been considerably complicated. As a result, many of the extensive claims of great economies to be effected by the use of magnetic recording have been considerably modified and conversion programs are now more in the nature of plant modernization. The great demand for smaller and lighter portable equipment for
Fig. 2. The Aquaflex underwater photographic unit.
location, has been, possibly, the strongest influence in affecting the choice of magnetic recording, as magnetic-recording equipment has been the answer to this problem.
Since April 1, 1950, all Paramount production, both in the studio and on distant location, has been done on super-portable recording channels, weighing 65 Ib and using 173^-mil recording stock18 (Fig. 3).
New portable magnetic-recording systems for 35-mm, 17^-mm or 16-mm film, featuring compact, light weight construction, were introduced by Westrex, and are now in wide use in studios both here and abroad19 (Fig. 4).
The use of magnetic equipment and re-recording has gained momentum. It has become the practice in a number of studios to record rehearsals on magnetic film. A good "rehearsal" becomes a "take" and unsatisfactory
Progress Committee Report
571