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A redetermination of the constant of gravitation has boon made using the torsion balance in vacuo.The large masses were steel cylinders weighing about 66 kg, and the small masses spheres of gold, platinum, and optical glass final result obtained is 6.670 X10" 8 cm 3 g" 1 sec." 2 .While the results obtained appeared to differ slightly with small balls of gold, platinum, or glass, it was shown by a special experiment with the form of torsion balance used by Eotvos that this is not to be attributed to difference in material.
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Paul R. Heyl (1930) studied this question.
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