American cinematographer (Oct 1933)

October 1933 • American Cinematographer 253 Recent Patents Pertaining to Motion Pictures Compiled by Patent & Technical Information Service 1336 New York Avenue N. W. Washington, D. C. August 1, 1933 1,920,789. Film Driving Apparatus. Charles L. Heisler, Schenectady, N. Y., assignor to General Electric Company. In apparatus for recording sound on a film and for reproducing sound from a record film including a sprocket and a drum ar- ranged to engage a film at spaced points thereof, means for regulating the speed of the drum in accordance with the speed of the film as moved by the sprocket, including a brake and a controlling mem- ber therefor movable in response to changes in the length of the film between the sprocket and drum and having a mass operative to maintain the control- ling member in contact with the film and to control the pressure applied by the brake, the mass of said member serv- ing to render the brake substantially un- responsive to sudden small variations in the speed of the film. August 8, 1933 1,921,037. Sound Recording. Ken- neth F. Morgan, Los Angeles, Calif., as- signor to Electrical Research Products, Inc., New York, N. Y. The method of recording sound which comprises moving a photographic medium at uniform speed through a beam of light of constant in- tensity, varying the mean time of ex- posure of said medium to said beam directly with the envelope of the volume variations of sound recorded and causing virtually complete modulation of the light from said beam falling on said medium for all volumes of sound recorded. 1,921.404. Continuous Film Proces- sing Machine. James Crabtree, Chatham, N. J., assignor to Bell Telephone Labora- tories, l-nc., New York, N. Y. The com- bination with the developing chamber of a continuous film processing machine having means for guiding and moving a photographic film, of means for eliminat- ing directional effect in the developing of said film, said means comprising a plurality of wiping units secured to said chamber along the path of travel of said film at an angle to the longitudinal axis thereof. 1,921,469. Film Editing Machine. John J. Kuhn, Elizabeth, and Roy V. Terry, Montclair, N. J., assignors to Bell Telephone Laboratories, Inc., New York, N. Y. In a film editing machine, a hing- iing unit having a single hinge pin, a film viewing lens, a lens mounting hinged to :said pin, a mask for said lens having an aperture through which the film may be edited also hinged to said pin, a film guide, a pad for holding said film firmly in said guide, means whereby said lens, mask and pad may be variably positioned with relation to said guide and film, means including said hinging unit where- by the lens and mounting may be raised away from said mask for marking a pic- ture as framed by said mask and means including said hinging unit whereby said lens mounting and mask may be raised as a unit away from said guide and film. 1,921.954. Motion Picture and Sound Record Film. Donald H. Stewart, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester, N. Y. In the art of reproduction of sound from photographic records, the method of re- ducing objectionable sound effects at the point of change-over from one accom- paniment to another on the same con- tinuous record which comprises applying to the sound record adjacent the point of change-over a layer which progressively increases the density of the record. 1.921.963. Fade-In and Fade-Out for Motion Picture Film Sound Record. John I. Crabtree, Rochester, N. Y., as- signor to Eastman Kodak Company, Rochester, N. Y. In the art of sound photography, the method of reducing the objectionable sound effect at the change- over from one piece of sound record to another which comprises obscuring part of the sound record at the change-over point by applying a piece of opaque, flexible material. 1.921.964. Motion Picture and Sound Record Film. John I. Crabtree and Charles E. Ives, Rochester, N. Y., as- signors to Eastman Kodak Company, Rochester, N. Y. The combination with a spliced motion picture film having thereon two areas bearing photographic sound records joined together at their ends, of a transition piece attached in superimposed relation over the junction of the two sound records, said transition piece having an extension joined to the main portion thereof by a weakened connection. August 15, 1933 1,922.742. Cinematographic Appara- tus. George A. Mitchell, Palms, Calif., assignor to Mitchell Camera Corporation, West Hollywood, Calif. In combination with motion picture apparatus having an aperture, means for holding the four marginal portions of a film picture area in said aperture substantially in the plane thereof, and crowned roller means for slightly bowing said area of the film in two dimensions, said roller means being behind the film to bow said area toward the aperture. August 22, 1933 1,923.746. Modification of Sound Records. Roy J. Pomeroy, Los Angeles, California. The method of producing volume-modified sound records, that in- cludes: audibly reproducing sound from a record to be modified, artificially modi- fying the volume characteristics of the CAMERA CRAFT A MONTHLY MAGAZINE OF PHOTOGRAPHY Camera Craft gath- ers beauty, facts, fundamentals and all sorts of interest- ing information from all over the world to keep its readers fully informed. It has a Cine Department that makes a spe- cialty of new wrinkles and infor- mation not to be found elsewhere. .00 per Year Sample copy on request CAMERA CRAFT PUBLISHING COMPANY 703 Market Street San Francisco, California WE WANT 35 mm. travel, fight, thrill and curiosity films from all parts of the earth. Send description and length All kinds of film at reduced prices Continental Film Craft, Inc. 1611 Cosmo Street Hollywood, Calif.