Motography (Jul-Dec 1913)

October 18, 1913 MOTOGRAPHY 287 Recent Patents in Motography By David S. Hulfish PATENT No. 1,043,275. For an Improved Film Feeding Mechanism. Issued to John Urie, Bayonne, N. J., assignor to L. G. B. Erb and J. A. Golden. In this new intermittent movement, the film is carried by sprockets upon a frame which slides vertically. The sprokets turn steadily, but by the combination of a I i, 043,275 steady sprockets with the vertical reciprocating movement of the frame which carries them, an intermittent movement of the film is produced. The arrangement of parts and speeds is so attained that a film feed of three-quarters of an inch for each picture is produced with a vertical movement of only three-eighths of an inch in the reciprocating frame. Referring to the drawing reproduced herewith, the camera is shown, but the inventor explains that the invention may be used in a projector as well. The camera case is labeled A, and the lens B is in the right-hand wall. Behind the lens B is the rotary shutter C, and behind the shutter a guide for the film D. The film is carried over the idler drum G upon the sliding carriage F, and the film is driven by the steady sprocket G2, also upon the sliding carriage F. A vertical driving shaft J 2 carries two opposed cams, / above and /' below, the carriage F being included between the faces of these cams and being propelled up and down by the cam faces as the cams turn. Friction wheels or rollers F' and F2 are placed upon the carriage F at the points of engagement with the cams. The steady feed sprocket G2 is driven by spiral gears carried by the sliding frame F, one of the spiral gears, N', being arranged to surround the vertical driving shaft L5 and to slide upon it, yet to be turned by it by engagement of a spline or key. A similar pair of gears are arranged to drive the upper feed drum G but are not shown in the drawing. In describing the method and manner of the operation of the new intermittent device, the inventor says : When the machine is running and a reciprocating motion is given to the carriage F and a rotating motion to the shutter C, as above explained, then the film D is bodily reciprocated with the carriage F and at the same time a continuous traveling motion is given to the film. Now during the time that the two speeds are equal and opposite, it is evident that the image on the film 13, during the total exposure, remains in the same portion of the film, and during this time the opening of the shutter C is in register, so that the image is taken or a projection is made of a picture onto a screen. During the down stroke of the carriage F the next following portion of the film D is carried downward in register to permit of taking a second picture or projecting such picture on the upstroke of the carriage F. From the foregoing it will be seen that although a continuous traveling motion is given to the film D, each picture is in register during a portion of the upstroke of the carriage F. The nine claims are written upon the features of driving the frame and of driving the feed sprockets steadily from the steadily turning shafts while the carriage and the sprocket spindles themselves maintain an independent reciprocating motion. Patent No. 1,042,801. For an Improved Container or Storage Can for the Protection of Moving-Picture Films. Issued to Isidor Kitsee, Philadelphia, Penna. The preliminary statement of invention discusses the causes of explosions and the remedy invented, and is quoted in full below, together with one of the five claims : The films on which the pictures for kinematographic exhibition are photographed or printed consist of a celluloid, the product of a nitrated fiber intermixed with a camphor. The frequent occurrence of explosions of stored films is not due to a direct contact of a spark with the film proper, but is due to an elevation of the temperature of the inclosed air, surcharged with the gaseous products of the composition from the film. These products generally carry a nitrous compound with them, and these gaseous products elevate the temperature of the inclosed air. It is the aim of my invention to prevent such destructive explosions. I have found that if a nitrated material is embedded in a carbonate compound, the gases given off by said material are neutralized, the temperature remains stationary and no deterioration is ascertainable. When two films, each inclosed in a receptacle, are subjected to a higher temperature; one film embedded in a carbonate, the other film minus said carbonate, then the film without the carbonate will inflame at a far lower temperature than the film embedded in the carbonate, for the reason that the gaseous products of the film embedded in the carbonate are neutralized as soon as they are given off, whereas the gaseous products of the other film tend to raise the temperature and explode. To protect, therefore, a film used for kinematographic exhibition, it is only necessary to embed the same in a carbonate or ammonium compound, such for instance as a bi-carbonate of ammonium, sodium, etc. I preferably provide for the film a container and place the carbonate in said container. Claim 1. A container for the storage of moving picture and like films lined with an agent for neutralizing gases given off by the film stored therein. No. 1,044,135. For an Improved Method of Manufacture of Projecting Screens. Issued to Albert O. Buechner, Zurich, Switzerland, assignor to the firm of Prana Gesellschaft fur Tageslicht Projektion mit Beschrankter ITaftung, Hamburg, Germany. The product of this method, in its most convenient