Loyal B. Aldrich and Others at SAO Site, by Unknown, c. 1920, Smithsonian Archives - History Div, Loyal B. Aldrich, who worked for SAO from 1908-1956 and was its director from 1944 to 1955, and others outside the living quarters of the Smithsonian Astrophysical Observatory solar station. The solar station operated from 1920 to 1955 at Mt. Montezuma, Chile. Two men are seated in an automobile and one man is petting a dog..