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The universal Newtonian gravitational constant is being redetermined at the National Bureau of Standards with use of the method of Boyes in which the period of a torsion pendulum is altered by the presence of two 10. 5-kg tungsten balls. The difference in the squares of the frequencies with and without the balls is proportional to G. The resulting value of G is (6. 67260. 0005) 10^-11 m^3 sec^-2 kg^-1
Luther et al. (Mon,) studied this question.
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