Arthur L. Day

Arthur L. Day (born Oct. 30, 1869, Brookfield, Mass., U.S.—died March 2, 1960, Washington, D.C.) was a U.S. geophysicist known for his studies of the properties of rocks and minerals at very high and very low temperatures. He investigated hot springs and earthquakes, the absolute measurement of high temperatures, and physical and chemical problems regarding volcanoes. Day was with the U.S. Geological Survey from 1900 until 1907, when he became director of the Geophysical Laboratory...