How did the first telephone work by Alexander Graham Bell?

Alexander Graham Bell's big breakthrough came on 10 March 1876 when he used what he called a 'liquid transmitter'. ... Shouting to his assistant, Thomas Watson heard the message on the receiver in another room and rushed through to Bell, who had just made the first phone call.Nov 28, 2011 read more

A man operating Alexander Graham Bell's first telephone Alexander Graham Bell’s big breakthrough came on 10 March 1876 when he used what he called a ‘liquid transmitter’. This was a vertical metal cone with a piece of parchment stretched like a drum over its narrow end at the base. read more

Alexander Graham Bell (1847-1922), the Scottish-born American scientist best known as the inventor of the telephone, worked at a school for the deaf while attempting to invent a machine that would transmit sound by electricity. read more