Audion vacuum tube being held in a hand. This device,invented in 1906 by the US inventor Lee De Forest (1873-1961),is a vacuum tube that can amplify signals. This photograph is courtesy of the DeForest Laboratories,and forms part of a collection of unpublished images,dating from the 1860s to the 1920s,taken for 'The Pageant of America: A Pictorial History of the United States' (1925-1929) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / NEW YORK PUBLIC LIBRARY / MIRIAM AND IRA D. WALLACH DIVISION OF ART, PRINTS AND PHOTOGRAPHS |
Taille de l’image : | 2732 px × 3425 px |
Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
Property Release : | Non requis |
Restrictions : | - |