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A Eötvos Torsion Balance is a geophysical prospecting instrument that is used to determine distortions in the gravitational field, i.e. to detect local anomalies in the earth's gravitational field. These anomalies are due to concealed features, in this case undulations in the rock strata under a varying thickness of superficial glacial deposits. The torsion balance was being used to investigate the buried topography of the drift-filled pre-glacial Kelvin Valley. In total sixty-eight stations were investigated over three months in December 1927 and January-February 1928.
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