Edison the Operator: The Telegraph Years of an Inventor Before the light bulb, Edison was the fastest fist many offices had seen. This guide traces his telegraph years and the quadruplex that funded the laboratory. Quick facts First job Port Huron, 1863 Signature skill copying press wire Quadruplex 1874 Sale price $40,000 Menlo Park opened 1876 Edison's key work taught him circuits, batteries and the value of multiplexing - sending more than one message on a wire. The quadruplex windfall bought Menlo Park; the phonograph, the lamp and the grid followed. Start now: morsecodeworks.com Morse Code Works - free Morse code tools and guides. Reference chart