Before revision: History Telegraph relay contacts and spring In 1809 Samuel Thomas von Sömmerring designed an electrolytic relay as part of his electro-chemical URL Solely electrical relays got their start as a further improvement to telegraphs, with
After revision: History Telegraph relay contacts and spring In 1809 Samuel Thomas von Sömmerring designed an electrolytic relay as part of his electro-chemical URL Electrical relays got their start in application to telegraphs.