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

378 ABSTRACTS [j. s. M. P. E. A system of gears connected through a drive shaft enable rotary motion to be transmitted to the disk film. Rectilinear motion may be imparted to the carriage whereby a spiral record on the film may be reproduced through an optical system by the advancing of the film at the end of each complete revolution thereof. 1,780,311. Home Motion Picture Projector. A. PAPO AND A. GENTILINI. November 4, 1930. Relates to a home projector for motion picture film in which an optical system and reflector are mounted on a carriage and movable in a line normal to the optical axis of the projecting machine. The reciprocatory carriage contains a reflecting prism adapted to be aligned with the light source for directing the light rays through a projecting lens upon an exhibiting screen. The carriage is reciprocated by the engagement of a pawl with the film. A shutter is actuated as the carriage is reciprocated by engagement of the pawl with the film, thereby obscuring the picture during the return movement of the carriage under action of the spring. The reciprocating carriage, containing the shutter mechanism, a prism, and a reflecting lens, eliminates the usual construction of rotary shutter and renders the construction of the machine more compact for home operation. 1,781,945. Alignment Guide for Sound Track on Motion Picture Projector. T. W. CASE. Assigned to Case Research Laboratory, Inc. November 18, 1930. Covers a guide for film having a sound track thereon where the film rides over a body portion of the guide and is held in contact therewith so that the sound record on the film registers with a longitudinal channel in the guide at one side of the picture, record on the film. The shoe which maintains the film against the guide is spring-pressed and is designed to eliminate wear or scraping of the film while maintaining the film in accurate alignment so that the sound track is directly in alignment with the channel portion of the guide through which light rays pass to the sound portion of the film. 1,783,169. Means for Winding Endless Cinematograph Films. M. HARPER. November 25, 1930. Relates to a drum for the winding of endless films. The drum comprises two plates, one made in the form of a flat ring and the other solid, with rollers carried around the periphery of the flat ring and the plate. There is an aperture in the plate in which a roller is mounted for the passage of the beginning of the film as it is unwound from the lower layer on the peripheral rollers. The entire rotatable drum is mounted in a horizontal position adjacent to the projection machine and adjusted to continuously take the film from the center of the reel and restore the film after projection to the exterior of the reel. 1,783,399. Binocular Motion Picture Camera. A. AMES, JR. December 2, 1930. Relates to a method of and apparatus for making motion pictures of the type in which the screen image is binocular in the sense of containing a composition of images from two different points-of-view representative of twoeyed vision. The invention is particularly concerned with obtaining the effect of retinal rivalry, so-called characteristic of normal human binocular vision. Images are formed from different points-of-view and different parts of a sensitive film successively exposed during separate exposures, following each other at intervals within the time of the persistence of vision of each of these images severally. Thereafter the successively different parts of the film are exposed