Where was the first successful film "Mirror" filmed? What is the technical principle of mobile camera?

1891On May 20th, the first successful mobile movie mirror was displayed to the public at Edison Laboratory in West Orange, New Jersey. This modified machine is equipped with a motor, which can let 50-foot-long film pass under a magnifying glass for people to watch. Put in a coin to start the motor, and watch it for about half a minute alone. On July 3 1 of the same year, Edison applied for a patent for a movable film projector in the United States. 1893, the world's first film "studio" was built in the courtyard of Edison's laboratory. 1896, he also used the phonograph to provide sound and music for his mobile viewing machine.