Alexander was spending so much time and energy on his inventions he did less and less work with his students and soon ran out of money. He was about to give up when he met professor john Henry, an expert on the telegraph and electricity. Professor Henry realised immediately that Alexander had made an amazing discovery and encouraged him to continue with his experiments.
In order to survive financially bell had to work on the musical telegraph, but he also continued working on his mechanical voice transmitter On that summer afternoon in 1875, when Alexander heard the first sound transmitted over his machine he realized that he had finally achieved his goal.
almost a year later, in march 1876, the first words were heard coming through the phone