British Kinematography (1953)

124 Vol. 22, No. 4 TECHNICAL ABSTRACTS A II the periodicals here abstracted may be seen in the Society's Library RAPID DRYING OF NORMALLY PROCESSED BLACK-AND-WHITE MOTION PICTURE FILM Miller, F. D., J. Soc. Mot. Pic. & Tel. Eng., 60, Feb. 1953, 85. The introduction of rapid drying technique for rapidly processed film suggests its possible application for the drying of normally processed motion picture films. Consideration of the drying process seems to indicate that hot impinged air should be the most satisfactory method of commercial practice. Experiments were made on a laboratory machine in which the film passes between two parallel air chambers. Small holes in the sides of the chambers facing the film permit hot air to impinge on both sides of the film. Air temperatures ranging from 125°F to 210°F and air velocities of 2,000 to 6,000 ft./min. were used. Eastman Fine Grain Release Positive Safety Film was dried in 10 sees, on laboratory equipment of this type and Eastman Plus X Panchromatic Negative Safety Film was dried in 16 sees. The physical properties of several films dried in this equipment were quite similar to the properties of conventionally dried films, but this is not true of all types of film. Rapid driers can be extremely compact and their power requirements should be no greater than for conventional driers. Author's Abstract. FURTHER EXPERIMENTS IN HIGH-SPEED PROCESSING USING TURBULENT FLUIDS. Katz, L., and Esthimer, W. F., Ibid, 105. The results of an investigation into the effects of turbulence in the rapid processing of photographic film under fixed conditions are described. For test purposes a turbulent processing machine was constructed permitting rapid switching of fluids and elevating of resulting reactions. Author's Abstract. TELEVISION CAMERA EQUIPMENT OF ADVANCED DESIGN. Pourciau, L. L., Ibid, 166. The servo mechanisms and mechanical design features of a television camera chain are described. The chain, in order to achieve flexibility and ease of operation, features remote control of lens selection and focus. Centralized functional controls are grouped together for operating convenience. The equipment is compact, light in weight and sturdy for field use, yet meets the high performance standards required in the studio. Author's Abstract. SPLICING MOTION PICTURE. SAFETY FILM WITHOUT CEMENT OR ADHESIVES. Herzig, L. A., Ibid, 181. A method and apparatus for butt-weld splicing motion picture film, not requiring the usual scraping or cements, are described. The principle is based on a combination of a controlled heat and cooling gradient applied under pressure within a given time cycle, and producing a homogeneous splice. Properties of the film are not affected, as the film is automatically pre-plasticised prior to splicing. The method may be used for all types of safety film. Author's Abstract. PROPOSED AMERICAN STANDARD, PH 22.75 : A AND B WINDINGS OF 16mm. SINGLE-PERFORATED FILM. Ibid, 189. NEW EQUIPMENT As in the case of technical papers, the Society is not responsible for manufacturers' statements, and publication of news items does not constitute an endorsement. 16mm. SOUND-FILM PROJECTOR The British Thomson-Houston Company's new output of 30w, and " Ardoloy " peckers which greatly 16mm. sound-film projector, designated Type 401, reduce claw wear. supersedes Type 301. While similar in appearance The 401 gives a light output of over 300 lumens to the 301, the new projector incorporates a number from a 750-watt, 115 volt tungsten lamp with a of improvements and changes in design. 2-inch f/1.5 projection lens. Mechanical noise is so There is a considerable reduction of mechanical reduced that a sound absorbing case around the noise, a saving in weight, a new amplifier giving an projector is no longer necessary.