FIG. 4.—DRIVING GEAR AND FILM SUPPORT.
FIG. 5.—THE CINEMATOGRAPH IN OPERATION.
CAMERA FOR RIBBON PHOTOGRAPHY.
The camera for ribbon photography which we [illustrate] is the invention of Mr. C. F. Jenkins, the inventor of the “vitascope,” which we have already described. Instead of using a rotary disk shutter, the radial apertures, and a fixed lens, this camera has a single opening in the front, the size of the aperture being regulated at its rear end by a diaphragm disk having radial slots of varying widths cut therein. The operator is thereby enabled to govern the amount of light admitted to the lenses according to the subject to be photographed and the length of the exposure desired. This disk is rotated by hand, like an ordinary stop in a wide-angle lens. Back of the diaphragm disk is the battery of lenses, each of the same focus, arranged in a circle, joining each other, upon a rotating disk which is secured to a shaft which extends rearward and terminates in a bevel gear wheel which meshes with a side bevel gear wheel fixed upon the main shaft, suitably geared to the main driving shaft.