Journal of the Society of Motion Picture Engineers (1930-1949)

Si is PATENT ABSTRACTS [J. S. M. P. E. tivity of a control circuit of a sound reproducing amplifier system. The metal sound record may be directly impressed upon a silver coated copper strip or a celluloid film may be softened by suitable solvents and metallic powder sprinkled over its surface. Heat and pressure are then applied, so that the particles are incorporated in the film; a metallic film is then electrically deposited upon this. The latter will adhere to the particles, and thus be held firmly to the film. The sound record of variable resistance is passed between a pair of brushes which lead to the input circuit of a sound reproducing amplifier for controlling the reproduction of sound therefrom. 1,816,397. Sound Recording and Reproducing Monitoring Apparatus. F. H. OWENS. Assigned to Owens Development Corp. July 28, 1931. Provision is made for listening in on the sound record at the time sound is being recorded or at the time of sound reproduction so that the operator can judge as to the volume and quality of the sound. Two recording lamps are provided and connected in series. One recording lamp operates directly upon the film while the other recording lamp operates upon a light-sensitive cell in an auxiliary pick-up circuit. The second recording lamp serves as ballast or resistance for the first recording lamp and prevents overloading thereof 1,816,409. Non-inflammable Protecting Coating to Motion Picture Films. L. L. STEELE. Assigned one-half to T. Moore of Washington, District of Columbia. July 28, 1931. A motion picture film is provided with a coating on each side which will not take flame if the film for any reason stops before the arc of the projecting machine; that will not take flame from contact with a lighted cigarette; that will maintain its original pliability under the destructive action of the intense rays of the arc light for a markedly longer time than the original film (thereby increasing the useful life of the film), and very materially curtailing fire hazard; that will be practically scratch proof in so far as injury to the gelatin emulsion image is concerned and which will decrease the tendency for dust, oil, or other foreign matter to adhere to the film, make it possible to clean films without injury to them in the process, and make films absolutely waterproof. The coating which is applied to the film has optical properties such that the projection values of the coated film are enhanced, that is, a brighter, clearer picture results on the screen. 1.816.831. Combined Electrical Recorder and Reproducer for Phonographs. O. M. DUNNING. Assigned to Thomas A. Edison, Inc. August 4, 1931. A stylus arm is provided with two stylus points, that is, a recording stylus and a reproducing stylus. The stylus arm is mounted in such a manner that the recording stylus may be vibrated from an electrical system for placing a sound groove on the sound record or the reproducing stylus may be moved into position for vibrating an armature within an electromagnetic field and generating current which may be used to operate an amplifier system and control a sound reproducer. 1.816.832. Simultaneous Control of Two Reproducers by Film Switches. C. W. EBELING. Assigned to Harrison W. Rogers, Inc. August 4, 1931. Two film-controlled switches are provided for controlling two sound reproducing machines for operation one at a time. The sound reproducing machines are selectively started and stopped by the film-controlled switches in accordance with the movement of the film. A sound amplifier and reproducer is connected