Title: Ivory diptych sundials, 1570-1750
Subjects: Catalogs, Diptychs, Exhibitions, Sundials, Antique clocks & watches, Clocks & chronometers, c 1500 to c 1600, c 1600 to c 1700, c 1700 to c 1800, History, Astronomical Instruments, Science, Science/Mathematics, Science / General, Ivory carving, Harvard University. Collection of Historical Scientific Instruments