British Kinematography (1949)

20 B.S.I. COMMITTEES ON KINEMATOGRAPHY In accordance with the usual procedure of the British Standards Institution, the following draft British Standards have been prepared and circulated for comment : — Draft British Standard for Spools for 35mm. release prints in 2,000 ft. lengths. Draft British Standard for Electrical connectors for stage use. Draft British Standard for 16mm. release prints. Draft Revision of British Standard 677 — Motion Picture Films. Work is actively in hand on the following projects : — Technical Committee CME/2 — Revision of BS.677. Technical Committee CA1E/3 — Spools for 35mm. films, 16mm. release .prints. Technical Committee CME/4 — Spot -lights for kinema studios, ripple content in electricity supplies to kinematograph studio lamps, auditorium safetylighting and safety-signs, electrical filters, photo-electric cells. Teclmical Committee CME/10 — Magnetic sound-on-film, magnetic sound-ontape and discs, magnetic sound-on wire ; materials for magnetic soundrecording. Technical Committee CM E/ 11 — Screen brightness in the projection of 35 and 16mm. film. Technical Committee CME/13 — 16mm. kinematograph projectors ; film life, performance, spools and containers, other aspects arising from installation and maintenance. Spools and containers for 8mm. film. Technical Committee CME/14 — ^fechanical and dimensional aspects of 35mm. projectors, projection rooms for 35mm. projectors, theatre projection screens. Technical Committee CME/IQ — Lenses for 35mm. projectors, method of determining resolving power of 35mm. projector lenses. Technical Committee CME/18 — Lenses for 16mm. projectors, method of determining resolving power of 16mm. projector lenses. In addition, a draft British Standard for the photometric calibration of lenses (determination of T-number) has been prepared under the Photographic Section of the B.S.I, and will shortly be circulated . BRITISH STANDARDS B.S. 1479 : 1948— Use of Sound Level Meiers. — The sound level meter consists of a microphone combined with an amplifier, detector, and meter, designed to give r.m.s. indication, adjusted to the equal-loudness curve of the ear. Precautions in the use of the meter and limitations to its accuracy are set out. 1488 : 1948 —Test-films for 16mm, kinematograph projectors. — Six types of film are specified : buzz-track, sound-focusing, picture unsteadiness, multi frequency, 3,000-cycle flutter, and a sound-andpicture test-film. Revision 935 : 1948 — Photographic exposure tables. — This British Standard provides data for calculating out-door daylight exposures for black-and-white negative material and for black-and-white and colour reversal material. AMERICAN STANDARDS The following American Standards have been issued recently and are reproduced in the November issue of the /. Soc. Mot. Pic. Eng. : — Z22.29— 1948 : Theatre Projection Screens. Z22.57— 1947 : Buzz-Track Test Film for 36mm. Motion Picture Sound Reproducers. Z22.60— 1948 : Theatre Sound Test Film for 35mm. Motion Picture Sound Reproducing System Z22.62— 1948 : Sound Focusing Test Film for 35mm. Motion Picture Sound Reproducers (Laboratory Type). Z22.65— 1948 : Scanning-Beam Uniformity Test Film for 35mm. Motion Picture Sound Reproducers (Service Type). Z22.66— 1948 : Scanning Beam Uniformity Test film for 35mm. Motion Picture Sound Reproducers (Laboratory Tvpe). Z22. 67—1948 : 1,000-Cycle " Balancing Test Film for 35mm. Motion Picture Sound Reproducers. Z22.69— 1948 : Sound Records and Scanning Area of Double Width Push-Pull Sound Prints, Normal Centreline Type. Z22.70— 1948 : Sound Records and Scanning Area of Double Width Push-Pull Sound Prints, Offset Centreline Type.