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A rotating torsion balance experiment to measure Newton's constant

J H Gundlach

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We have developed a new method to determine the gravitational constant. This method severely reduces the sensitivity to the leading sources of error in previous torsion balance measurements: it is mostly free of uncertainties due to anelastic torsion fibre properties. The torsion pendulum mass density distribution does not have to be known accurately. Gravitational effects due to mass distribution changes in the vicinity are reduced. The apparatus is currently under construction.


PACS

07.10.Pz Instruments for strain, force, and torque

06.30.Dr Mass and density

07.10.Lw Balance systems, tensile machines, etc.

04.80.Nn Gravitational wave detectors and experiments

Subjects

Instrumentation and measurement

Gravitation and cosmology

Dates

Issue 6 (June 1999)

Received 28 January 1999, accepted for publication 8 March 1999, in final form 8 March 1999



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