A new determination of the constant of gravitation by means of the torsion balance has been made in the hope of improving the precision of the result published in 1930. A number of suggested improvements in the apparatus were tried, and two of these were adopted The result obtained shows so slight an improvement over the 1930 result that it appears that the limiting point of diminishing returns has been reached with this form of apparatus.
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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 .
The absorption of sound at oblique angles of incidence has up to the present been purely a matter of theory, no experimental work having been published on the subject. Theoretical discussions have been given, which appear to be in error m an essential point, namely, the overlooking of the probable existence of rotational motion in the region of absorption.
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