Put on for an audience of 200 invited attendees at the “Society for the Development of the National Industry”, the reaction to the moving black-and-white pictures caught the brothers by surprise. They had attended the conference to share Louis’ recent work on colour photography and only showed the 45-second film La Sortie des Usines Lumière (Workers Leaving the Lumière Factory), as a novelty after Louis’ lecture.
The machine used to project the film had been patented by the brothers the previous month. Their father owned a photographic materials factory in Lyon and told his sons about the Edison kinetoscope that he had seen in Paris in 1894. Inspired by their father’s enthusiasm they invented the Cinématographe which combined a camera, developer and projector into a single unit. Its drive mechanism was based on the “presser foot” used in sewing machines, and used a clawed gear to engage with perforations in the side of a roll of film. As the gear rotated, individual frames moved in front of the lens to capture the moving image at a rate of 12 frames every second. The same mechanism could later be used to project the captured images.
The positive reception to the first film screening led the brothers to refine their invention and, on 28 December 1895, they staged their first public show at the Grand Café in Paris. Within less than a decade, however, the brothers withdrew from the motion picture industry and instead turned their attention to the development of colour photography, a technology that they went on to dominate for a number of years with their Autochrome process.