Motography (Apr-Dec 1911)

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212 MOTOGRAPHY Vol. VI, No. 5. Recent Patents in Motography By David S. Hulfish UNITED STATES Patent No. 996,647. Attachment for Lamphouse for Observing the Arc. Sydney Julian Jacobson, Washington, D. C, Assignor, by direct and mesne assignments, to John H. Bruninga, trustee, Washington, D. C. The subject of this patent is a neat little attachment which may be applied to any lamphouse, and which will The 996,647. offer a convenience <:o the projection operator, illustration explains it very clearly. The bracket 20 is attached to the side of the lamphouse, and carries the tube 21. Upon the outside of the tube 21 the carrier 22 is arranged to slide and the carrier 22 holds the lens 23. Upon the inside of the tube 21, the rod 25 or a second tube 26 is arranged to slide, and the rod 25 then carries the screen plate, 24, which may be of ground glass, of scratched mica, or of any material desired. A sheet of white paper will answer the purpose. By adjusting the lens 2$ and the screen plate 24 at proper distances, with the lens 23 also at proper relation before the hole ip in the side of the lamphouse, an image of the arc will be projected upon the screen plate 24 much as the picture of the film is projected upon the screen before the audience. The size of the image of the arc, as projected upon the screen plate 24 will depend upon the distance from the arc itself to its image on the plate, and also upon the focal length of the lens 23. The focal length of the lens must be less than one-quarter of the distance from arc to plate. The entire arrangement may be very compactly set against the side of the lamphouse, if a small image of the arc is acceptable to the projection operator. No. 996,952. Film Actuating Mechanism for Moving Picture Machines. Charles R. Uebelmesser, New York, N. Y., assignor to American Moving Picture Machine Co., of same place. The efforts which are being made in the United States patent office for the production of a machine which does not require rewinding of the films are very gratifying, indeed. It has been asserted that the greater part of the wearing and scratching of the motion picture film comes from the rewinding rather than from the projection of the film. This statement is prompted, and per haps justified, by a consideration of the high speed at which films usually are rewound, and by a consideration of the care which is manifested in the projection machine for the protection of the film against scratching. Mr. Uebelmesser, the patentee in the present instance, is patentee in a number of other instances looking toward the production of a projection machine which will not require rewinding of the films between projections. In the illustration, a side view of the motion head, with a diagrammatic delineation of the course of the film strip through the head is given. The magazine, 20, is provided with a large number of rollers or roller guides for handling the outside of the film coil. The leader end of the film leaves the inside of the film coil at the point 14-a and passes upward through a pair of inclined roller guides. The protecting channel 18 carries it up to a point above the lens, where three sets of guide rollers, labeled ij, 17 and 17, carryit to the upper steady feed sprocket 16. From the upper steady feed sprocket 16, its course is quite regular, passing the film window and the intermittent sprocket, also labeled 16, then the lower steady feed sprocket, also labeled 16, and finally entering the magazine 20 and being wound upon the outside of the film coil. In this way, the condition of the film coil after the projection of the picture is caused to be exactly the same as it was before the projection of the picture, namely, an open coil of film with the leader in the middle and the tail outside.