Filtering by: People Aitken, Robert Grant, 1864-1951 Remove constraint People: Aitken, Robert Grant, 1864-1951 People Tucker, R. H. (Richard Hawley), 1859-1952 Remove constraint People: Tucker, R. H. (Richard Hawley), 1859-1952 Place Mount Hamilton Remove constraint Place: Mount Hamilton Topic Astronomical instruments Remove constraint Topic: Astronomical instruments Topic Astronomical observatories Remove constraint Topic: Astronomical observatories