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72 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
Sound-proof cabinets for the cameraman are being replaced by sound absorbing coverings over the camera.
A report of the use of the spring drive has been published as applied to several makes of cameras.^^ Four patents have been granted on different types of driving mechanisms.^^ The design of various pressure plates for camera gates have been patented.^^ Kotation of the lens to secure exposure on a wide film in a curved gate has been protected.^* A professional tripod suitable for supporting the added weight of sound cameras has been made available commercially.^^ Other accessories relate to focusing devices,^® and modified designs of film magazines.^''
A black matte varnish for minimizing troubles from reflected light on the interior of lens barrels and camera cases has been described.^^ To facilitate the making of stills during progress of the action, an ordinary camera is attached to a motion picture camera.^^ Reflected images simulating the effect of photographing a subject over an expanse of quiet water are obtained with a cone shaped device which is attached to the front of the camera.®^ A glass plate with a reflecting surface bisects the cone horizontally and the lower half of the cone opening is closed thus causing the upper half of the lens to record the reflected image. Another still camera of especial interest is the stereoscopic camera developed by H. E. Ives.^^ The picture is made from different angles, as the camera is moved along a track in front of a subject. A glass grating with dark lines and clear spaces is placed in front of the sensitive fllm and a similar grating is placed before the finished picture.
There has been some activity in the use of cameras taking film 70 mm. wide both by Fox and R. C. A. Photophone. The latter in conjunction with G. K. Spoor are stated to be working on a stereoscopic sound film.^^
A patent has been taken out by the Askania-Werke Akt.-Ges. on a time-lapse camera equipped with special filters.^^
Studio Light Sources. With the more general adoption of panchromatic negative film stock during the past two years, there has been a gradual increase in the use of incandescent lighting replacing to a certain extent, mercury vapor and arc light units. A studio census taken in February, 1929 showed that a fairly large number of the sixty or more pictures in progress were being photographed with incandescent lamps. On one very large set, over 4,800 lamps