The Constant of Gravitation Photographic Collection contains photographs of the scales and other instruments used for the determination of the constant of gravitation at the National Bureau of Standards between 1924 and 1942. Paul R. Heyl of the Mechanics and Sound Division made his first redetermination of the constant of gravitation (G) in 1930. In 1942, Heyl and Peter Chrzanowski published the results of a new determination of the constant of gravitation made with an improved torsion balance. Only slight improvement in precision over the 1930 result was achieved.
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