Record Unit 474, Smithsonian Astrophysical Observatory, Records, 1893-1899
Robert C. Child was appointed Assistant in the Astrophysical Observatory (APO) in 1893. In 1894 his title was changed to Aid, Acting in Charge, APO, a position he retained until 1896. Charles G. Abbot joined the APO as an Assistant in 1895. The following year he became Aid, Acting in Charge, APO.