Peter Hewitt,US electrical engineer

Numéro d’image : 11653667
Peter Hewitt,US electrical engineer
Peter Cooper Hewitt (1861-1921),US electrical engineer. Hewitt invented a mercury-vapour lamp (patented 1901) and built the first mercury arc rectifier (1902). Early models of the lamp were a thin tube with a pool of mercury filling the lamp with mercury vapour. Current flowing between electrodes and through the mercury vapour discharged a bluish-green light. The mercury arc rectifier,used to convert alternating current to direct current,was used in industry and on the railways. This signed 1918 photograph is from a collection of unpublished images obtained for 'The Pageant of America: A Pictorial History of the United States' (1925-1929)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 : 2575 px × 3388 px
Model Release : Non requis
Property Release : Non requis
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