Signedunsigned
ProvenanceHarold Clarence Ernst, MD, Boston, c. 1900-1922 (no. 94); Mrs. Ellen L. Ernst (his widow), Jamaica Plain, MA, 1922; on loan to the Museum of Fine Arts, Boston, 1923-1938; gift to Harvard College Observatory, 1938; transfer to CHSI, 1964.
Published ReferencesSteven A. Lloyd, Ivory Diptych Sundials, 1570-1750 (Cambridge: Collection of Historical Scientific Instruments, 1992), cat. no. 38.