Lot 440
FRENCH IVORY CASED MAGNETIC AZIMUTH DIPTYCH Y
17TH CENTURY
Auction: 14 May 2019 at 11:00 BST
£688
Description
the hinged casing with an equinoctial dial and polar dial to one side and a pewter disc depicting a perpetual calendar to the other, opening to a pewter lunar volvelle and a horizontal dial with a pewter elliptical hour scale, the ivory case engraved with poppies
Dimensions
7cm wide
Footnote
Note: for a very similar example see Stephen Lloyd, Ivory Diptych Sundials 1570-1750; Catalogue of the Collection of Historical Scientific Instruments, Harvard University (Harvard University, 1992), p. 131.