An early radio vacuum tube. Carl W. Mitman, Curator of Engineering at the United States National Museum, holding an early radio vacuum tube. It was made in 1898 by D. McFarlan Moore of New York. Radio waves emanating from this tube ignited a bomb a city block away. Photographed in 1924. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Library of Congress |
Taille de l’image : | 5354 px × 3957 px |
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