![]() ![]() Then, on Friday, March 10, 1876, Bell was working with the transmitter while Watson was tinkering with the receiver across the house. A sound moved the paper, varying the resistance of the needle’s contact with the acid, which then changed the current. The needle was attached to a sheet framed parchment, with a horn to concentrate the sound. His arrangement wasn’t sensitive enough, so Bell tried dipping a needle into acid. ![]() With mechanic Thomas Watson, he endeavored to make electric currents imitate sound waves. While experimenting with a harmonic telegraph, Bell noticed that a strip of iron near an electromagnet replicated vibrations from a similar piece and magnet connected by wires. In 1870, Bell went to Boston and opened a school for teachers of the deaf. Both inventors’ ideas were similar, but Bell’s speech and hearing knowledge gave him an advantage Bell’s father and grandfather were both speech and hearing professionals. Soon after he submitted papers for the telephone to the US Patent Office, Elisha Gray warned that he was going to submit too. On Valentine’s Day in 1876, Alexander Graham Bell was about to tell the world about an invention that would assist personal communication. Episode #6 of the c ourse “Inventions that changed the world and their stories” ![]()
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