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In the course of his efforts to perfect a multiple telegraph. Bell had invented a little machine, that he had used in teaching the deaf. It was j a cylinder with a membrane stretched across one end and a stylus (a thin stick) attached to the membrane. When someone spoke into a cyl- | inder, the membrane vibrated and the stylus traced a zigzag line on 1 smoked glass.-This little machine that he called the jihonautograph, gave him a key to the invention of the telephone.
Beil took on an assistant, Thomas A. Watson, who knew about electricity a lot more than Bell did. The two men were working on the multiple telegraph, when Bell’s idea for the telephone came to him.
In 1876, when Bell showed his first model of the telephone, it was t still a rather simple instrument. This was the year of the Centennial,​}
that celebrated the first hundred years of progress in the United States.​i
To celebrate the event they organized a big exhibition in Philadelphia. Bell, who thought that his invention wasn’t fpiite ready, rather reluctantly agreed to exhibit it. The telephone receiver was connected with the transmitter across the room.
One of the distinguished gjiests, the Emperor of Brazil, asked Hell to demonstrate his machine, leaving the Emperor at the receiver the 'inventor went4a ihe transmitter on the other side of the room and started' reciting Hamlet’s monologue “To be or not to'bo” into it. The shocked and amazed Emperor soon rushed to Hell with the tails of his formal coat flapping. “It tnjks,” he cried. The other judges gathered about and took turns listening. Bell’s invention was immediately called the greatest of the time. Alexander Graham Hell recelvwl the Centennial prize awards for hot!» the .multiple telegraph ami the telephone. In Ын memoirs Bell wrote: “I went to bed, the night before, an unknown шял, and awoke to find myself famous.