WILLIAM GILBERT -hypothesized that the Earth is a giant magnet GALILEO GALILEI -performed fundamental observations, experiments, and mathematical analyses in astronomy and physics; discovered mountains and craters on the moon, the phases of Venus, and the four largest satellites of Jupiter: Io, Europa, Callisto, and Ganymede SIR ISAAC NEWTON -developed theories of gravitation and mechanics, and invented differential calculus BENJAMIN FRANKLIN -the first American physicist; characterized two kinds of electric charge, which he named ``positive'' and ``negative'' HENRY CAVENDISH -discovered and studied hydrogen ALESSANDRO VOLTA -pioneer in study of electricity; invented the first electric battery ANDRÉ MARIE AMPÈRE -father of electrodynamics AMADEO AVOGADRO -developed hypothesis that all gases at same volume, pressure, and temperature contain same number of atoms HANS CHRISTIAN OERSTED -discovered that a current in a wire can produce magnetic effects SADI CARNOT -founded the science of thermodynamics WILHELM E. WEBER -developed sensitive magnetometers; worked in electrodynamics and the electrical structure of matter JAMES PRESCOTT JOULE -discovered mechanical equivalent of heat HERMANN VON HELMHOLTZ -developed first law of thermodynamics, a statement of conservation of energy
LORD KELVIN (born WILLIAM THOMSON) -proposed absolute temperature scale, of essence to development of thermodynamics
SIR JOSEPH WILSON SWAN -developed a carbon-filament incandescent light; patented the carbon process for printing photographs in permanent pigment JAMES CLERK MAXWELL -propounded the theory of electromagnetism; developed the kinetic theory of gases ERNEST MACH -proposed ``Mach's principle''which states that “the inertia of an object is due to the interaction between the object and the rest of the universe” CHARLES GOODYEAR
-discovered rubber
THOMAS ALVA EDISON