British Kinematography (1953)

182 Vol. 22, No. 6 TFCHNICAL ABSTRACTS SOUND-ON-FILM RECORDING USING ELECTRO-OPTIC CRYSTAL TECHNIQUES Dressier, R., and Chesnes, A. A., J. Soc. Mot. Pic. & Tel. Eng., 60, 205, 1953. This paper deals with the theoretical and practical aspects of a sound-on-film recorder with no moving parts, utilizing the birefringence properties of certain crystals. The physical properties of various crystals, as well as final performance measurements of the entire sound system, are discussed. Authors' Abstract AN INTERMEDIATE POSITIVE-NEGATIVE SYSTEM FOR COLOUR MOTION PICTURE PHOTOGRAPHY Anderson, C. R., Groel, N. H., Horton, C. A., and Zwick, D. M. Ibid, 217. A colour printing system for motion pictures is outlined employing : Eastman Colour Negative Safety Film, Type 5247 ; Eastman Separation Panchromatic Safety Film, Type 5216 ; Eastman Colour Internegative Safety Film, Type 5243 ; and Eastman Colour Print Safety Film, Type 5381. The sensitometric characteristics of the two intermediate materials are described. Some methods of using them and the problems involved in colour registration printing are discussed. Authors' Abstract. KINESCOPE RECORDING FILM EXPOSURE CONTROL Lovell, R. E., and Fraser, R. M. Ibid, 226. Various devices have been perfected to control accurately the exposure of video pictures to be recorded on motion picture film. These devices, combined with sensitometric control, take much of the guesswork out of the kinescope recording process. Authors' Abstract. HISTORY AND PRESENT POSITION OF HIGH-SPEED PHOTOGRAPHY IN GREAT BRITAIN Chesterman, W. D. Ibid, 240. The history of high-speed photography in Great Britain is outlined, beginning with intermediate-rate cameras, defined as those in which the film is transported continuously through the camera mechanism at speeds not exceeding 40 m/sec. Then follows a survey of drum cameras, in which a single loop of film is transported at speeds up to 240 m/sec. on a rotating drum, or where images are swept along the stationary film at this rate by moving optical parts. Recent developments in light sources of short duration are discussed and the review concludes with a description of some research studies in zoological biological and medical researches, and some recent military applications. Author's Abstract. PRECISION FILM EDITOR UTILIZING NON-INTERMITTENT PROJECTION Johnke, T. Ibid, 253. Maximum efficiency in editing film both in production studios and in television stations is the objective of a recently developed preview-and-editing machine which utilizes a continuous projection process in place of the customary intermittent movement and shutter. Because projection is continuous, and because all parts are machined that no portion of the film except the sprocket hole area ever comes into contact with any surface, valuable originals and fine-grain masters can be edited safely on this machine. Author's Abstract. THE BRIDGAMATIC DEVELOPING MACHINE Tanney, J. A., and Krause, E. B. Ibid, 260. A need was felt for a reasonably priced, quickly accessible, self-contained automatic film processor for television stations and small laboratories. This led to the design of the Bridgamatic machine which embodies standard commercial design plus a continuous overdrive, tension-relieving devices, straightline film flow and ease of handling. 16mm. and 35mm. negative-positive and reversal models are described. The add-a-unit idea was adopted, so the bare machine can later be equipped with whatever refinements are desired. Authors' Abstract. THE STEREOSCOPIC ART. Norling, J. A., PS. A. Journal, Nov./Dec, 1951, and Jan./Feb., 1952. An accelerated interest in stereoscopic photography has been inspired in recent years by the appearance of compact, well designed cameras and viewing devices marketed at moderate prices. These new products and their increasingly widespread use support the belief that any art such as stereoscopic representation depends for popularity, indeed for survival, on the equipment available to enable people to practice the art. Author's Abstract. RECOMMENDATIONS OF THE NATIONAL TELEVISION SYSTEM COMMITTEE FOR A COLOUR TELEVISION SIGNAL Loughren, A. V., J. Soc. Mot. Pic. & Tel. Eng., 60, 321, 1953.