Dakota Powell and Gregory Powell. Grandchildren from Fredrika (Mrs. James Spillman) include Eric Spillman, Meg Spillman and Toby Spillman. Publications Tracy, J.; Powell, W.M. (1949), Star Fragments in Oxygen and Helium under Bombardment by 90 MeV Neutrons, University of California, Berkeley, Radiation Laboratory Brueckner, K.; Powell, W.M. (1949), Charged Particles Emitted by Carbon Bombarded by 90 MeV Neutrons, University of California, Berkeley, Radiation Laboratory Powell, W.M.; Oswald, L.O. (November 30, 1956), The Geneva Cloud Chamber, University of California, Berkeley, Radiation Laboratory References External links Science: Anti-Physics, TIME (April 21, 1958). 20th-century American physicists 1903 births 1974 deaths Harvard Law School alumni Harvard College alumni