Search
- Telegraph Key Used by Julius McMartin to Communicate with Thomas A. Edison on a Homemade Line between Their Homes, circa 1859 - This telegraph key was used by Julius McMartin to communicate with twelve-year-old Thomas A. Edison on a homemade line installed between their Port Huron homes in 1859. Telegraph keys act as switches. They complete an electrical current to open and close relays at receiving stations. Longer or shorter closures produce the telegraphic code.
- circa 1859
- Collections - Artifact
Telegraph Key Used by Julius McMartin to Communicate with Thomas A. Edison on a Homemade Line between Their Homes, circa 1859
This telegraph key was used by Julius McMartin to communicate with twelve-year-old Thomas A. Edison on a homemade line installed between their Port Huron homes in 1859. Telegraph keys act as switches. They complete an electrical current to open and close relays at receiving stations. Longer or shorter closures produce the telegraphic code.