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126 OKIGINAL PETITION^ EXHIBIT 9.
of such size and shape that the teeth 24 can pass through them, and when the wheels 23 and 25 are rotated in the direction indicated by the arrows each tooth in succession will strike the face of wheel 25, thereby bringing the film absolutely to rest at the same moment that an opening in the shutter exposes the film, and will then pass through a notch, allowing the tape-film to be moved forward another step while it is covered by the shutter. . To avoid the danger of the wheel 25 moving so quickly that a tooth cannot enter the proper notch, a laterally-projecting tooth 29 is provided adjacent to each notch. When a tooth 29 strikes a tooth 24, the latter tooth will be guided by the tooth 29 into the adjacent notch 27.
30 is a detent spring or pawl to prevent backward movement of the wheel 23.
I prefer to so proportion the parts above described that the wheel 23 is at rest for nine-tenths of the time in order to give to the sensitized film as long an exposure as practicable and is moving forward one-tenth of the time, and said forward movement is made to take place thirty or more times per second, preferably at least as high as forty-six times per second, although the rapidity of movement or^ number of times per second may be regulated as desired to give satisfactory results. The longer interval of rest of the film insures a good impression of the object projected thereon and results in a picture having clean and sharp lines, since the film has sufficient time to become steady and overcome the vibration caused by the sudden and rapid motions of the feed mechanism. On the shaft 26 or on any suitable shaft driven by the motor is a revolving disk 31, serving as a shutter for alternately exposing and covering the sensitive film. This disk, which is continuously revolving, is provided with six or any other suitable number of apertures 32 at regular intervals around it near the edge, they being so arranged that one of the apertures passes directly between the camera-lens 33 and the film each time the film is brought to rest, the light-rays passing through the opening 33^ and falling on the film half-way between the reels on which the film is wound.