-
Made by Robert Hooke, it is the first version of the "telephone" , and it conveys sounds over a taut extended wire by using mechanical vibrations. (Day and month are unknown.) https://www.shoretel.com/history-telephone
-
Innocenzo Manzetti has the idea of an electric "speaking telegraph", or what would be a similar concept to the telephone. (Day and month are unknown.) http://www.richardgrigonis.com/2011-01-15.html
-
When wanting to give his musical automaton (self-operating machine) a voice, Innocenzo Manzetti ends up inventing the Speaking Telegraph, but doesn't plan to patent it and ends up letting other people branch off of his idea later on. (Day and month are unknown.) http://www.richardgrigonis.com/2011-01-15.html
-
Alexander Graham Bell gets this idea of a "telephone" while vacationing with his parents at their farm house in Brantford, Canada. His father, Alexander Melville Bell makes notes of his son's discovery in his journal. https://books.google.com/books?id=ujlCgf1uSJIC&pg=PA151
-
Elisha Gray Invents the liquid transmitter for use in a telephone, but does not build one.
A Liquid Transmitter is basically a "water microphone", in which sound waves from a human voice cause a diaphragm to vibrate which causes a needle or rod to vibrate up and down in water that has been made conductive by a small amount of acid. -
The very first commercial telephone company is created and starts up business near Berlin. This is because of their use of the Siemens pipe as a ringer and telephone devices built by Siemens. http://cdrtools.sourceforge.net/private/tel.html
-
In 1878, the very first commercial US telephone exchange was established in the area of New Haven, Connecticut. Using past technologies (Berlin's commercial telephone company), this business was made. http://cdrecord.org/private/tel.html
