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