Search Results for: Photographic laboratory apparatus
barnesville, ohio , the son of christiana (edgerton) and david gray. [ ] his family were quakers . he was brought up on a farm. he spent several years at oberlin college where he experimented with electrical devices. although gray did not graduate, he taught electricity and science there and built laboratory
july , u.s. patent improvement in electric telegraph for transmitting musical tones, issued july , u.s. patent automatic circuit-breakers for electro-harmonic telegraphs, filed jan , , issued feb , u.s. patent electro-harmonic telegraph, filed jan , , issued feb , u.s. patent telephonic telegraph apparatus...
https://en.wikipedia.org/wiki/Elisha_Gray