BULLARD, SIR EDWARD (CRISP)

born Sept. 21, 1907, Norwich, Norfolk, Eng. died April 3, 1980, La Jolla, Calif., U.S. British geophysicist noted for his work in geomagnetism. He became professor of geophysics and director of the department of geodesy and geophysics at the University of Cambridge in 1964. In his research on the structure of the Earth's crust and the Earth's internal constitution, he made valuable studies of radioactive heat generation within the Earth and of the Earth's thermal history. One of his most important contributions to the study of geomagnetism is his theory of the geomagnetic dynamo, based on convective motion within the Earth's core. Bullard was knighted in 1953.