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

March, 1931 ] ABSTRACTS 379 to the images simultaneously. The resultant effect is that the form of the object observed on the screen appears real and relative distances are given with effect of depth in the picture. 1,784,138. Nonstop Motion Picture Projector. C. M. GOTTSCHAU. December 9, 1930. A motion picture projector of the type having a continuous film without the necessity of rewinding of the film prior to a subsequent exhibition. The driving mechanism for the film includes a running drive for the reel which is adapted to slip under a predetermined resistance. A starting drive is provided which is more positive than the running drive. Means are provided for automatically disconnecting the starting drive after a predetermined movement of the reel. 1,784,515. Binocular Nonstop Motion Picture Camera. H. K. FAIRALL. Assigned to Multicolor, Ltd. December 9, 1930. A device for intermittently advancing the film in a motion picture camera. The movement comprises a pair of cranks each adapted to directly support and operate the film advancing means. The cranks operate simultaneously to shift the film advancing means in step-by-step movement at uniform speed for each frame of the picture. 1,785,336. Stereoscopic Motion Picture Film and Method of Making. J. BURKHARDT. Assigned to Third Dimension Pictures, Inc. December 16, 1930. A motion picture film for securing relief or stereopticon effect in reproduction. The pictures are printed in miniature in pairs disposed transversely on the film. The film is of standard width and stereoscopic or third dimension effects or illusions are obtained by the pairs of pictures. The background of each pair has thereon a mask of the foreground picture of the pair. 1.786.025. Optical System for Reproducing Sound Records. F. H. OWENS. December 23, 1930. Covers a system for subjecting a film to a beam of light where the gates through which the light passes may be removed out of contact with the film. The movement of a film directly against the usual slit results in the accumulation of dirt and other foreign matter in the slit which clogs it and interferes with the function of the optical system. An optical system is used which produces a converging beam of light, the focus of which passes through a slit located substantially at the focus of the light beam, the beam diverging from the slit for illuminating a film which is spaced from the slit. There is a second slit on the other side of the film for producing from the light beam a beam of light of reduced divergence which is focused upon a light-sensitive cell. The slits which control the passage of light from the source upon the light-sensitive cell are disposed in spacial relation to the film and do not contact with the film in the course of the movement of film past the slits. 1.786.026. Lamp House for Sound Picture Apparatus. F. H. OWENS. December 23, 1930. A lamp housing for the light source in the talking picture attachment for a motion picture projecting machine. The lamp housing is constructed with a pair of integrally connected sides through one of which the optical system extends and on the other of which the light source is supported in alignment with the optical system. A hinged structure comprising the two remaining sides of the housing provides a support for the cathode control rheostat, the required meters, the control switches for the light source. The lamp housing may be compactly mounted with respect to the parts of the motion