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  1. This method of copying ridged film is applicable not only to individual "still" pictures as here described, but also to motion picture film. For this purpose there are three alternatives; (1) The films for taking and for projecting could be made up, one with vertical, the other with horizontal ridges; (2) Both taking and projecting film could be made with longitudinal ridges, but in taking, the camera could be used on its side. Because of the oblong shape of the frames the taking film could be narrower, but should move further between exposures than the projecting film; (3) Diagonal ridges could be used at approximately 45° to the sides of the film. In the copying procedure of Fig. 7 the 45° ridges of negative and positive would stand at 90° to each other.

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This method of copying ridged film is applicable not only to individual "still" pictures as here described, but also to motion picture film. For this purpose there are three alternatives; (1) The films for taking and for projecting could be made up, one with vertical, the other with horizontal ridges; (2) Both taking and projecting film could be made with longitudinal ridges, but in taking, the camera could be used on its side. Because of the oblong shape of the frames the taking film could be narrower, but should move further between exposures than the projecting film; (3) Diagonal ridges could be used at approximately 45° to the sides of the film. In the copying procedure of Fig. 7 the 45° ridges of negative and positive would stand at 90° to each other.

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