The motion picture projectionist (Nov 1931-Jan 1933)

March, 1932 Motion Picture Projectionist 25 ♦ RECENT PATENTS This page is conducted by Mr. Ray B. Whitman, Patent Attorney, 230 Park Avenue, New York City. Copies of any of the patents cited may be obtained by addressing the "Patent Editor," this magazine, and enclosing fifteen cents to cover costs. 1,839,315. MOVING PICTURE PROJECTOR. Harry Hoover, New York, N. Y., assignor to Abe Maskow, New York, N. Y. Filed Apr. 26, 1928. Serial No. 273,014. 2 Claims. (CI. 88—19.3.) 1. In a moving picture projector, a source of illumination, a gate through which film is fed, a shutter comprising a transparent glass tube located between the source of illumination and the gate whereby the intensity of heat rays on the film is diminished, an opaque spot of sufficient area and suitably positioned to obscure the film in the gate during movement of same on said tube, means for rotating, said tube and means for intermittently moving film through the gate in synchronism with the shutter. 1,842,759. TRANSMISSION OF MOTION PICTURES AND THE LIKE. William Malm, New Orleans, La. Filed Aug. 22, 1927. Serial No. 214,753. 7 Claims. (CI. 178—7.) 1. The combination with a radio transmitting device and a motion picture film actuating device, of means for exploring images of moving objects on said film in parallel linearly-aligned groups of component parts of definite areas, in vertical unidirectional paths, successively adjacent from 'left to right, then from right to left, and then from left to right again, etc.; comprising a horizontally reciprocating opaque structure having a vertical _ slot of definite size, and operating in conjunction with a revolving opaque structure having a plurality of equidistant radial slots of definite size, and a light responsive device which reacts with light rays passing thru said film and successive cross points of said vertical slot and each of said radial slots, and relays corresponding electrical impulses to said radio transmitting device, a rotary electric switch driven by said film actuating device, and controlling impulses from said light responsive device; said switch to render said light responsive device inoperative when said film is in motion, and operative when said film is at rest. 1,841,382. FILM STABILIZER FOR SOUND PICTURE PROJECTORS. Jess C. Rose, Los Angeles, Calif. Filed Nov. 19, 1929. Serial No. 408,245. 1 Claim. (CI. 179—100.3.) In a sound projector having a film feed reel, sound record reproducing means, a slip-driven take-up reel, and film driving means for feeding the film to the reproducing means: a film sprocket mounted on the projector beyond the reproducing means and arranged to pull the film past said means, another film sprocket mounted on the projector over which the film subsequently passes before reaching the takeup reel, the film being formed with a loop between said sprockets, and the last sprocket acting as a hold-back against irregularities in film tension due to the operation of the take-up reel, and means to drive said sprockets together with the first mentioned film driving means. 1,841,540. METHOD OF RECORDING ELECTRICAL IMPULSES FOR PRODUCING PICTURES AND SOUND. Harry T. Leeming, Jersey City, N. J. Filed May 31, 1928. Serial No. 281,959. 3 Claims. (CI. 178—6.) l^&C] 3. A system for recording and reproducing picture effects comprising a disc shaped record having inscribed thereon grooves with undulations corresponding to the picture effects, a drive shaft for rotating said record, a reproducing stylus and a magnetic pick-up head engaging said grooves, a reproducing circuit connected with said reproducing head, an amplifier in said circuit, a light valve controlled by said reproducing circuit and controlling a source of light, a scanning disc controlling said source of light gear connected with said drive shaft and means for projecting the light from said source, upon a screen. 1,843,007. PLURAL IMAGE OPTICAL SYSTEM. Leonard T. Troland, Cambridge, Mass., assignor to Technicolor Motion Picture Corporation, Boston, Mass., a Corporation of Maine. Filed Apr 2 1929. Serial No. 351,885. 8 Claims. (CI. 88—1.) 1. Photographic apparatus of the type having a plural image forming optical train employing a common objective for the respective images, comprising a pair of partial reflectors disposed in planes making different angles with the axis of the objective and positioned to intercept different proportions of light from the objective. 1,842,658. OPERATING MECHANISM FOR FIRE PREVENTION APPARATUS. Joseph Ellis Cohen and John Francis Adams, Philadelphia, Pa., assignors to Sentry Safety Control Corporation, Philadelphia, Pa., a Corporation of Delaware. Filed June 1. 1928. Serial No. 282,245. 8 Claims. (CI. 88 — 17.) 4. In combination with fire prevention apparatus for a motion picture machine which has a light source for projecting the images of a film and means for feeding the film, of a pencil of light adjacent the normal loop of the film, a control circuit for the apparatus including a photo-electric cell upon which said pencil is adapted to act and which, when the film loop is displaced abnormally and so as to interrupt said pencil will operate said apparatus.