1893 - Thomas Edison received two U.S. patents. The first was for a "Cut Out for Incandescent Electric Lamps" and another for a "Stop Device" (No. 491,992-3). Also No. 492,150 for "Process of Coating Conductors for Incandescent Lamps."
... in the gyroscope.
The physics of this device looks confusing at first sight, but is surprisingly simple. It can easily be understood with a little knowledge of ...