Arthur Louis Day

Arthur Louis Day was an American geophysicist born October 30, 1869, in Brookfield, Massachusetts, who died March 2, 1960, in Washington, D.C., and who taught at Yale University until 1897, worked at the Physikalisch-Technische Bundesanstalt in Berlin from 1897 to 1900, joined the United States Geological Survey from 1900 to 1907, and directed the Geophysical Laboratory of the Carnegie Institution for Science from 1907 to 1936. He investigated high temperature thermometry, seismology and geothermal energy, and the physical properties of rocks and minerals under extreme temperatures, continuing volcanic region studies in New Zealand after retirement. He served as vice president of the National Academy of Sciences from 1933 to 1941 and as president of the Geological Society of America in 1938, received the William Bowie Medal in 1940, the Wollaston Medal in 1941, and the Penrose Medal in 1947, and the Geological Society of America established the Arthur L. Day Medal in his honor in 1948.