Harold Delos Babcock (January 24, 1882 – April 8, 1968) was an American astronomer and the father of Horace W. Babcock. He was of English and German ancestry. He was born in Edgerton, Wisconsin, before completing high school in Los Angeles and was accepted to the University of California, Berkeley in 1901. He worked at the Mount Wilson Observatory from 1907 until 1948. He specialized in solar spectroscopy and precisely mapped the distribution of magnetic fields over the Sun's surface, working alongside his son. In 1953 he won the Bruce Medal. Babcock died of a heart attack in Pasadena, California at age 86. (From Wikipedia)
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Babcock, Harold D. (Harold Delos), 1882-1968: The Solar Spectrum, Lambda 6600 to Lambda 13495 (Carnegie Institution of Washington publication #579; 1947), also by Charlotte Emma Moore (page images at HathiTrust)
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Babcock, Harold D. (Harold Delos), 1882-1968: Revision of Rowland's Preliminary table of solar spectrum wave-lengths, with an extension to the present limit of the infra-red (Carnegie Institution of Washington, 1928), also by Charles E. St. John, Henry Augustus Rowland, Edward F. Adams, Louise M. Ware, Charlotte Emma Moore, and Carnegie Institution of Washington (page images at HathiTrust)
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