British Kinematography (1951)

98 BRITISH KINEMATOGRAPHY Vol. 18, No. 3 FLUTTER MEASURING SET F. P. Herrnield, /. Soc. Mot. Pic. & Tel. Eng., Aug. 1050, p. 107. With the latest proposed standards for flutter in view, the apparatus is designed to provide means of measuring low values of flutter at rates up to 200 c/s. with considerable accuracy and freedom from drift The carrier frequency is 3,000 c/s., and filters enable the bands 0-2, 2-20, 20-200, and 96 c/s. to be investigated separately. N. L. THE " EXPRESSOR " SYSTEM FOR TRANSMISSION OF MUSIC R. Vermeulen and W. K. Westmijze, Philips Tech. Rev., April 1950, p. 281. The authors discuss in some detail several aspects of the signal-to-noise ratio of a system and its bearing on volume range. Methods of increasing signal-to-noise ratio are then set out, and the application of compression-expansion to a Phillips-Miller installation, using the control track principle, is described and illustrated. N. L. DEBRIE SOUND REDUCTION PRINTER Bull, de V Assoc. Franc, des Ing. et Tech. du Cinema, 1950, No. 8, p. 15. The " Tipro Ris-2 " printer reduces the sound track from 35mm. to twin-16mm. film ; the use of an anamorphotic system is avoided by projection upon each 16mm. track of a duplicate image of the 35mm. track. The two films are driven by co-axial sprockets. R. H. C. CRISTIANI SYSTEM OF COLOUR AND STEREOSCOPY Bull, de V Assoc. Franc, des Ing. et Tech. du Cinema, 1950, No. 8, p. 8. By means of a four-cornered pyramidal prism, four separation images, taken respectively through blue, yellow, red and green filters, are produced in the space of a single normal 35mm. frame, and are projected additively. For stereoscopy, the right and left-hand pairs are projected and viewed through polarising filters. R. H. C. rK NEW HEAVY-DUTY PROFESSIONAL THEATRE PROJECTOR H. Griffin, /. Soc. Mot. Pic. & Tel. Eng., Sept. 1950, p. 313. The Simplex X-L 35 mm. projector embodies reduced mechanical load on the gear train ; automatic lubrication ; conical shutter ; lens mount accommodating 4in. diameter lenses ; built-in change-over unit ; 24-tooth continuous sprockets ; and air cooling of the gate. R. H. C. A NEW DE LUXE 35 mm. MOTION PICTURE PROJECTOR H. J. Benham and R. H. Heacock, /. Soc. Mot. Pic. & Tel. Eng., Sept. 1950, p. 319. The design of the RCA-100 projector is based upon that of the Brenkert BX-80. Features are automatic lubrication ; large size Maltese cross ; large glass door exposing the whole film path ; twin rear shutters ; and provision for 4in. diameter lenses. R. H. C. PHOTOGRAPHY IN TELEVISION R. H. Cricks, Functional Phot., Aug. 1950, p. 24. Film is used in television as part of a programme, and conversely for recording transmissions for subsequent repetition. The mechanical and photographic problems of film transmission are discussed, the work of the B.B.C. film unit is described, also the method of recording transmissions upon film. Author's Abstract. FROM THE OVERSEAS PRESS Publications quoted may be seen in the Society's Library. A MODERN LABORATORY FOR SOUTH AMERICA The Laboratories Alex have just been completed in Buenos Aires to meet the needs of South American production ; provision is made for processing blackand-white and bi-pack. Amer. Cine., Jan. 1951. UNINTERRUPTED TAKING AND PROJECTION OF FILMS To obviate the interruption of light by the shutter in both taking and projecting, it is proposed to pass a film or two films through two gates at right-angles, an optical system employing a mirrored shutter serving to expose or project one film while the other is moving. — Film-Technikum, Feb. 15, 1951. SPANNING THE CONTINENT BY RADIO RELAY A radio connection now extends from New York to San Francisco, operating in the 4,000 Mc/s range ; 105 relay stations are situated at about 30-mile intervals. The Type 416A vacuum triode which makes possible the use of such short \\ axelengths is the size of a walnut ; output power of each station is }-watt. — Bell Telephone Magazine. Winter, 1950-M