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162 Opinion on Camera and Film Patent.
limited by importing into them any of the operative devices, except those which are indispensable to effect the functional results enumerated. It will be observed that neither the means for moving the film across the lens of the camera, nor for exposing successive portions of it to the operation of the lens, nor for giving it a continuous or intermittent motion, nor for doing these things at a high rate of speed, are specified in the claims otherwise than functionally. Any combination of means that will do these things at a high enough rate of speed to secure the result of persistence of vision, and which includes a stationary single lens and tapelike film, is covered by the claims.
It is obvious that Mr. Edison was not a pioneer, in the large sense of the term, or in the more limited sense in which he Avould have been if he had also invented the film. He was not the inventor of the film. He was not the first inventor of apparatus capable of producing suitable negatives, taken from practically a single point of view, in single-line sequence, upon a film like his, and embodying the same general means of rotating drums and shutters for bringing the sensitized surface across the lens, and exposing successive portions of it in rapid succession. Du Cos anticipated hint in this, notwithstanding he did not use the film. Neither was he the first inventor of apparatus capable of producing suitable negatives, and embodying means for passing a sensitized surface across a single-lens camera at a high rate of speed, and with an intermittent motion, and for exposing successive portions of the surfaces during the period of rest. His claim for such an apparatus was rejected by the patent office, and he acquiesced in its rejection. He was anticipated in this by Marey, and Marey also anticipated him in photographing successive positions of the object in motion from the same point of view.
The predecessors of Edison invented apparatus, during a period of transition from plates to flexible paper film, and from paper film to celluloid film, which was capable of producing negatives suitable for reproduction in exhibiting machines. No new principle was to be discovered, or essentially new form of machine invented, in order to make the improved photographic material available for that purpose. The early inventors had felt the need of such material, but in the absence of its supply, had either contented themselves with such measure of practical success as was possible, or