Thomas Edison. Coloured portrait of Thomas Alva Edison (1847-1931),American inventor. Despite a lack of formal training,Edison was a prolific inventor,patenting about 1300 innovations. These included the phonograph,the electric light bulb and the alkaline battery. He solved problems by sheer weight of effort,claiming that "Genius is one percent inspiration and ninety-nine percent perspiration". He made only one scientific discovery,the Edison Effect. This applies in vacuum tubes,where electricity will flow from a hot electrode to a cool one,but will not do the reverse. This idea formed the basis of thermionic valves | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 2602 px × 3246 px |
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