Arthur Louis Day | |
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| Born | October 30, 1869 Brookfield, Massachusetts, U.S. |
| Died | March 2, 1960 (aged 90) Washington, D.C., U.S. |
| Nationality | American |
| Alma mater | Sheffield Scientific School at Yale University University of Groningen |
| Awards | John Scott Medal Bakhuis Roozeboom Medal William Bowie Medal (1940) Wollaston Medal (1941) Penrose Medal (1947) |
| Scientific career | |
| Fields | Thermometry Seismology Geothermal energy |
| Institutions | Yale University Physikalisch-Technische Bundesanstalt U.S. Geological Survey |
Arthur Louis Day (October 30, 1869 – March 2, 1960) was an American geophysicist and volcanologist. He studied high temperature thermometry, seismology and geothermal energy.