thomas alva edison

Thomas Alva Edison was born in 1847 in Ohio,America. As a little boy, he was very inquisitive. He always wanted to know how things were done. Very early in life, he showed that he was full of curiosity , a quaility which is so important to inventors. In 1869, he went to New York where he worked for sometime as telephone operator. But soon he became interested in invention. In a very short time he built a laboratory at Menlo Park to carry on his research. His first invention was a system of telegraphy. Then he invented phonograph, the first form of the instument that we now know as gramophone or record player. The word ‘phonograph’ means something that can write or record sound. Other scientists befor Edison had thought of instrument which acutely worked. He also invented incandescent lamp,a lamp in which the light is caused by a heated wire, called a filament. The wire is heated by an electric current. People could now use electricity to illuminate their homes. By the time Edison died in 1931, he had about a thousand inventions to his credit.