Abstract
THE most notable attempt to measure the variation of the force of gravity over the surface of the oceans was that made by Hecker in the early years of the present century; in 1901 he surveyed a track across the Atlantic from Lisbon to Bahia, following this up a few years later with the investigation of the Indian and Pacific Oceans and the Black Sea.
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DUFFIELD, W. The Investigation of Gravity at Sea. Nature 106, 732–734 (1921). https://doi.org/10.1038/106732a0
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DOI: https://doi.org/10.1038/106732a0