Portrait of Alexander Graham Bell (by R.Kastor)
Numéro d’image : 11827289
| Portrait of Alexander Graham Bell (1847-1922),Scottish-American speech therapist and inventor of the telephone. Bell followed his father and grandfather into the speech therapy profession,but also studied sound waves and the mechanics of speech. By 1871,he had moved to the USA,becoming professor of Vocal Physiology at Boston. There he performed his experiments in converting sound waves into electrical impulses for transmission down wires. In 1876,he patented the 'telephone',and founded what has become the AT&T Company. In later years he made many improvements to the telephone,worked with Langley and Curtis on flying machines,and founded the journal Science | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Library of Congress |
| Taille de l’image : | 4724 px × 3766 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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