Zenobe Gramme, Belgian electrical engineer, late 19th century.
© Science Museum / Science & Society Picture Library
Engraved portrait of Zenobe Gramme (1826-1901) who built the first direct-current dynamo using his 'Gramme ring', a ring-wound armature. Gramme's invention was the first electric generator to be used for commercial electro-plating and electric lighting. Illustration from 'Die ElektricitAt im Dienste der Menschheit' (Electricity in the service of mankind) by Alfred Ritter von Urbanitzky (b 1852), published in Vienna in 1885.