Portrait of Thomas Edison aged 14
Numéro d’image : 11828340
| Photograph of Thomas Edison (1847-1931),American inventor,at the age of 14. Edison received no formal education. In 1869,he invented a paper tape 'ticker' for sending stock prices across the country,and sold it for $30,000. He used this to establish an industrial research laboratory where he spent the rest of his life. His more notable inventions include the carbon granule microphone,the phonograph and the electric light bulb. During his life he filed 1069 patents. He also enriched physics by discovering that electricity flows from a heated filament to a nearby electrode,but not in reverse (the Edison effect) which formed the basis of the thermionic valve | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library |
| Taille de l’image : | 3426 px × 4621 px |
| Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
| Property Release : | Non requis |
| Restrictions : | - |
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