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01 from Watson, Experiences et Observations... , Paris 1748 02 03 from Guericke, Experimenta Nova... Amsterdam 1672, mthe first electrical genrator 04 from Volta, Scelta di Opuscoli, 1775 05 from The Royal Encyclopedia 1788-90 06 from Radio Engineering c1945 Component and Valve symbols 07 from Galvani, De Viribus... 1793 08 Popular Scientific Recreations c1895 09 Popular Scientific Recreations c1895 10 FORTUNE January 1950 left 11 FORTUNE January 1950 right 12 FORTUNE October 1946 13 Weekly Illustrated August 1945 14 Carrier June 1954 15 Allis Chalmers, February 1953 16 IBM January 1950
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