Unseen Comprehension-39 Alim (Thomas Alva Edison And His Discovery)

Thomas Alva Edison And His Discovery.

থমাস আলভা এডিসন এবং তার আবিষ্কার।

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 quality which is so important to inventors. In 1869, he went to New York where he worked for sometime as a telephone operator. But soon he became interested in inventions. In a very short time they were his chief business. In order to carry on his business, which was to become his life's work he built a laboratory at Menlo Park where he had gone to live. His first great invention was a system of telegraphy. Soon afterwards he invented the phonograph, the first form of the instrument that we now know as gramophone or record player. The word "Phonograph' means something that can write or record sound. Other scientists before Edison had thought of instrument which would do this. But Edison was the first man to make an instrument which actually worked. He also invented the 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.