Phonograph
Edison was developing a telephone transmitter in 1877 when he came up with the idea of recording and playing back telephone messages. He...
Electric Power System
Along with improving the electric lightbulb, he pateneted a system for electricity distribution and later founded the Edsion Illuminating...
Movie Camera
In 1888 Edison started creating a movie camera. However his first attempt needed many improvements because it was hard to focus. He later...