Bowie, William

Bowie, William

▪ American geodesist
born May 6, 1872, Annapolis Junction, Md., U.S.
died Aug. 28, 1940, Washington, D.C.

      American geodesist who investigated isostasy, a principle that rationalizes the tendency of dense crustal rocks to cause topographic depressions and of light crustal rocks to cause topographic elevations.

      Bowie was educated at Trinity College, Hartford, Conn. (B.S., 1893), and at Lehigh University, Bethlehem, Pa. In 1895 he joined the U.S. Coast and Geodetic Survey; he served as chief of the Division of Geodesy from 1915 to 1937. Bowie instituted systematic observations of gravity anomalies on land and encouraged gravity surveys in the oceans. These observations showed that the anomalies correlated with topographic features and validated isostasy as a geologic phenomenon. With John F. Hayford (Hayford, John Fillmore), his predecessor at the Coast and Geodetic Survey, he computed tables of the depth of isostatic compensation (the surface above which the weight of the crust per unit area is equalized). Bowie felt that this zone would occur at a uniform depth as predicted by John Henry Pratt, rather than at the varying depth predicted by Sir George Airy. His book Isostasy was published in 1927.

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