Michael Faraday, English chemist and physicist, c 1860.
© Science Museum / Science & Society Picture Library
Engraved portrait of Michael Faraday (1791-1867) who discovered the principles of the electric motor and dynamo. His great life work was the series 'Experimental Researches on Electricity' published over 40 years in 'Philosophical Transactions', in which he described his many discoveries including electromagnetic induction (1831), the laws of electrolysis (1833) and the rotation of polarised light by magnetism (1845). 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.