Search Results for: Apparatus ionising radiations instruments
church in highland park, illinois . at the church, on december , , gray gave the first public demonstration of his invention for transmitting musical tones and transmitted "familiar melodies through telegraph wire" according to a newspaper announcement. this was one of the earliest electric musical instruments
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