As the following letters indicate, extraordinary combined efforts of Everette Lee DeGolyer and Donald C. Barton, two of the most famous petroleum geoscientists prior to World War II, were needed to introduce the torsion balance into the United States in the early 1920s in order to prospect for salt domes in the Gulf Coast.

The letters describe DeGolyer's plans for the torsion balance and Barton's journey to Budapest, Hungary, to receive two instruments from Ferdinand Suss, to receive classroom and on-the-job training in German at the Eötvös Geophysical Institute, to ship them to the United States, and to test them...

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