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ABSTRACTS OF RECENT U. S. PATENTS
1,812,865. Valve for Magazines for Picture Films. A. DINA. Assigned to The Precision Machine Co., Inc. July 7, 1931. Entrance valve for film leading to a film magazine for preventing fire from following the film from the projection machine into the film magazine in the event of accident. The valve consists of a pair of heat conducting rollers, mounted adjacent to a pair of guide rollers at the entrance of the film magazine. The rollers form a narrow entrance slit for the film with respect to the magazine and quench fire from the film in case of accident by conducting away heat as rapidly as it is generated.
1,812,957. Electrically Operating Sound Recorder and Reproducer. C. HUENLICH. Assigned to Thomas A. Edison, Inc. July 7, 1931. An electromagnetically actuated stylus for cutting a sound groove in a cylindrical type sound record. The stylus is carried by a floating arm which is connected with an armature. The armature is electromagnetically vibrated by an electromagnetic driving unit for cutting a sound groove in the cylindrical wax record by correspondingly moving the stylus according to impressed sound vibrations for producing a "hill and dale" sound groove in the sound record.
1,813,000. Photographic Film Printer. F. B. THOMPSON. Assigned to Cinema Patents Co. July 7, 1931. A multiplicity of film printer units are connected together for permitting a multiplicity of positive prints to be made from a single negative while insuring the obtaining of a uniform light intensity at the point of exposure in each of the film printer units in accordance with the light intensity desired or required for the production of the positive from the negative in accordance with the scene passing through the unit. A battery of photographic film printer units is provided and the negative film driven through all the units. Each unit has a positive film passing therethrough which is printed from the negative film by printer mechanism disposed in each of the printer units.
1,813,204. Radio Photography Transmitter. V. A. SCHOENBERG. July 7, 1931. Scanning mechanism for a moving film in which each frame of the film is successively scanned. The scanning disk is mounted in alignment with the film and is so shielded that a single light beam passes therethrough in the course of its passage through the film. A framing structure is provided around the light aperture through the scanning disk and is adjustable for defining the active field of the scanning disk.
1,813,439. Lens for Photographic Cameras, Picture Projecting Apparatus, and Other Like Optical Devices. CLYDE J. COLEMAN. July 7, 1931. Lens for obtaining sharper definition of objects which includes a marginal stop formed with an aperture and a supplementary stop of smaller diameter than the aperture located near the surface of the lens remote from the source of light and in a plane between the marginal stop and the focal plane near the optical axis. The supplementary stop is adjustable toward or away from the marginal stop. With this arrangement an image of the objects on the optical axis and near it or the meridian on which the screen is situated is projected by those rays reflected therefrom that
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