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

March, 1931] ABSTRACTS 377 ABSTRACTS OF RECENT U. S. PATENTS 1,753,530. Sound Recording Apparatus. F. H. OWENS. April 8, 1930. Relates to an electromagnetically operated light slit in which a constant light source is provided in optical relation to a film in a sound recording system. The light slit consists of a pair of slidable shutter members, each being connected to separate diaphragms which are electromagnetically controlled from a voice control circuit. The diaphragms are adjustably connected with each of the shutter members constituting the light slit. Operation of the voice control circuit controls the position of the shutters and the exposure of the lightsensitive film with respect to the light source. 1,758,221. Motion Picture Camera. H. A. DEVRY. May 13, 1930. A motion picture camera in which the operating parts are compactly arranged within a portable case for utilizing standard size film, the parts being readily accessible for threading of the film and the inspection of the parts when the case is open. The camera is provided with a hinged side which may be swung outwardly from the casing to permit access to the supply and take-up spools, each of which may be removed end-wise from the casing. The intermittent film driving mechanism, the shutter mechanism, and the film guide are all arranged to be accessible from one side of the casing when the hinged cover is swung open. 1,759,914. Producing Films for Color Cinematography. A. PILNY. May 27, 1930. A method of producing film strips for cinematography, comprises splitting a series of images rectangularly and projecting them onto longitudinal parallel portions of a film strip by folding the strip longitudinally at right angles to unite the portions of the film for receiving the partial images. A film is employed in the making of the color motion pictures which is of double width and which is folded longitudinally upon itself. Partial pictures are produced in symmetrical arrangement to each other on the folded film, enabling a simple production of a positive color film by placing a film consisting of a colored layer impervious to light between the emulsion coatings on the folded film. 1,774,097. Pocket Cinematograph. P. HAUSER AND EDUARD PROBST. August 26, 1930. Relates to a diminutive motion picture projector which may be carried in a pocket. The projector is said to have a dimension of 2 in. by 4 in. by 1 inch. Two side plates are provided between which the film reels are journaled. One of the reels is driven through a hand crank and a gear system. The casing of the projector includes a lens system and a step-by-step movement mechanism for successively exposing the film to a light source which may be connected through a flexible cord with any suitable source of power. The particular feature of the invention is the telescopic portion of the case which may be telescopically dropped down from the casing to receive the end of the film as the projection process continues. 1,778,351. Motion Picture Projector Using Pictures on a Disk. L. W. BOWEN. October 14, 1930. A motion picture machine wherein a series of pictures are arranged spirally and radially on a transparent plate or disk film. The film is given both a rectilinear and an intermittent rotary movement in the course of projection of the pictures. The apparatus is housed inside a casing within which there is a carriage mounted for rotatively supporting a disk film.