Thomas Alva Edison (1847-1931) was one of the greatest and most prolific American inventors in history. He is well known for inventing the light bulb, the phonograph, the motion picture camera, and many other inventions totalling 1,093 US patents in his lifetime.
What is less well known is that in the 1920’s, Edison was working on a spirit communication device, which has its own page in this online encyclopedia called the “Edison Spirit Communication Device (ESCD)”.