Von Eotvos's torsion scale

Von Eotvos's torsion scale

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Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

Caption: Von Eotvos's torsion scale. This device, designed to measure gravitational acceleration, was built and operated by the Hungarian physicist Lorand von Eotvos (1848-1919). His 1889 experiment measured the differences in the gravitational acceleration of different masses. This difference was found to be effectively zero, showing that mass and inertia are equivalent. This is a central postulate of Einstein's 1915 theory of General Relativity. A torsion scale can measure tiny attractions between laboratory-scale masses, doing so by small changes in the torsion of twisted wires.

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Keywords: 1800s, 1889, 19th century, device, einstein, eotvos, equipment, equivalence principle, experiment, gravitation, gravity, hungarian, hungary, inertia, instrument, lorand eotvos, mass, one, physical, physics, relativity, research, single, torsion scale

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