A FRENCH IVORY DIPTYCH SUNDIAL
DIEPPE, 18TH CENTURY
The upper leaf outer face engraved with equinoctial dial, the inner face upper leaf with silvered brass lunar volvelle, lower leaf with engraved string gnomon dial and glazed compass with paper scale and blued steel needle (glass cracked), silvered folding latitude arm, brass hooks and a brass cover for the gnomon storage hole on the side (with ivory gnomon)
5 x 6 cm.
A FRENCH IVORY DIPTYCH SUNDIAL
DIEPPE, 18TH CENTURY
The upper leaf outer face engraved with equinoctial dial, the inner face upper leaf with silvered brass lunar volvelle, lower leaf with engraved string gnomon dial and glazed compass with paper scale and blued steel needle (glass cracked), silvered folding latitude arm, brass hooks and a brass cover for the gnomon storage hole on the side (with ivory gnomon)
5 x 6 cm.
