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The geological prediction was made that the Belle Isle salt dome might be much larger than supposed. The torsion balance was used to corroborate that prediction. From the data of the torsion-balance survey, calculations were made of the probable depth, thickness, and edge of the cap rock. Seven sulphur tests were drilled on locations made on the basis of the calculated conformation of the cap. The predictions in regard to depth were shown to be 73 per cent correct, and in regard to the thickness of the cap, 58 per cent correct. The causes of the errors were probably the unfavorable marshy terrane, the assumption of a slightly too small relative density for the cap rock, and the irregularity of the conformation of the dome.
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