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Electricity pioneers. Historical image of pioneers of the use of electrical energy at the awarding of the Franklin medal to Thomas Edison, in 1915. From left to right - Front row: Dr R.B. Owens (US electrical engineer), John Carty (1861-1932, US electrical engineer), Frank Sprague (1857-1934, US inventor), William Stanley (1858-1916, US physicist), Robert Tait McKenzie (1867-1938, Canadian sculptor, doctor and soldier). Back row: Samuel Insull (1859-1938, US-British pioneer of electrical infrastructure), Dr. Walton Clark (1907–1924), Thomas Edison (1847-1931, US inventor and pioneer of electric light) and his wife, Chevalier Van Rappard. Photographed at the Franklin Institute, USA, in 1915. (KEYSTONE/SCIENCE PHOTO LIBRARY/LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY)