Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From R. Wormell 'Electricity in the Service of Man'London, 1890. Engraving
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Image Number: 1746-19631135Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:6000×5532
