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How did W.K.L. Dickson develop the Kinetograph for Thomas Edison?

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Zazu Pitts, Gibson Gowland, and Hughie Mack in a dramatic scene from the silent film Greed (1924); Gowland stands center, supported by Pitts and Mack on either side. — Silent film era (From left) Zasu Pitts, Gibson Gowland, and Hughie Mack in the silent film *Greed* (1924), directed by Erich von Stroheim.

In 1888, Thomas Edison commissioned his laboratory assistant, W.K.L. Dickson, to create a motion-picture camera to serve as a visual accompaniment to the phonograph. While Edison provided the initial vision, Dickson performed the majority of the experimentation to develop the Kinetograph.12

Building on the work of predecessors like Eadweard Muybridge and Étienne-Jules Marey, Dickson successfully integrated two essential technical components:2

Intermittent Motion: He adapted an escapement mechanism—similar to that of a clock—to ensure the film strip moved through the camera in a regular, intermittent fashion.2
Sprocket System: He designed a system using regularly perforated celluloid film. The sprocket teeth engaged with these perforations along the edges of the film, ensuring precise synchronization between the film strip and the shutter.12

This innovation allowed the Kinetograph to record images at a rate of approximately 40 frames per second.12