Word: torsional
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...most delicate measurements made by the new methods is in the investigation of irregularities in the gravitational field of the earth by means of the torsion balance. Masses of density different from the surrounding rock, tend to deflect the direction of gravity and the change, though almost infinitesimal, from the standpoint of ordinary human experience, is capable of measurement by observing the amount of rotation of a light beam appropriately weighted and suspended on a thin platinum wire. Ore bodies themselves are rarely large enough to cause detectable variations in gravity, but large features such as heavier rock in cores...