When Edison was a boy of fifteen he worked as a telegraph operator. He had to be on  duty from 7 p.m. to 7 a.m. and give a signal every hour to prove that he did not sleep. The signals were made with  a stonishing exactness. One night  an inspector arrived and saw Edison sleeping on  the chair. He was about  a to shake him when he caught  a sight of the mechanism on the table near  the telegraph instrument. He waited to see what would happen. When  a hand of the clock pointed to an  hour, the instrument got busy and one level threw open the key while  other sent  a signal over the wire. The inspector seized the sleeping boy, roused him and fired him. That is why the first of Edison’s numerous inventions was never patented.

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