Transactions of the Society of Motion Picture Engineers (1929)

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Report of the Progress Committee 87 a luminous screen are photographed directly. By means of the ''osciographoscope," slight changes of heart pulsations may be photographed by a motion picture camera, and the heart sound recorded on a phonograph record. ^^^ The device combines the x-ray, the stethoscope, and the motion picture camera. Two arrangements for adapting a small motion picture camera for the photomicrography of biological specimens have been described by Schenunzky.^*^ A view finder and a camera mounting have also been made available for adapting any camera for motion photomicrography work.^*^ Tuttle and Trivelli^*^ have made motion photomicrographs of the progress of development of the individual silver bromide grains in a photographic image. C. Telephotography and Television The problems of transmission of ordinary photographs are so closely related to television that mention of progress in telephotography is felt to be justified in this report. Photographic sound records of three spoken words were transmitted by telephone across the continent to New York where the records were reassembled and incorporated in a sound film showing at one of the theatres.^^*^ It is now possible to transmit a picture five by eight inches in 48 seconds or a message at the rate of 630 words per minute according to Zworykin.^^^ In the transmitting device, a very efficient optical system supplies to the photo-electric cell enough light reflected from the picture so that only three stages of resistance coupled amplification are necessary between the cell and modulator. A detailed description has been published of the Fultograph system whereby the negative to be transmitted is printed on a zinc or copper cylinder coated with a resist of sensitized fish glue.^^^ A stylus passing over the surface transmits an electric current which is recorded at the receiving end on electrically sensitive paper. A brief account has been published of the transmission of a simple play by the Alexanderson system of television. ^^^ Regular schedules of radio movies have been established by the Jenkins Laboratories, Washington, D. C, for the transmission of silhouette images which later will be replaced by half-tone or shaded motion pictures.^^* A demonstration of radio motion picture transmission was given on August 8, 1928, in the Westinghouse Laboratory, signals being transmitted about four miles.^^^ Broadcasting of ordin