细节
A LATE 17TH EARLY 18TH CENTURY FRENCH IVORY DYPTICH DIAL, SIGNED ON THE COVER C.BLOVD A DIEPPE
THE COVER FURTHER ENGRAVED WITH A HORIZONTAL DIAL WITHIN A FOLIATE AND NEO CLASSICAL DECORATED BOARDER, THE INNER FACE OF THE COVER WITH LATITUDE SCALE TO ONE SIDE 0°- 80° AND WHITE METAL CALENDAR VOLVELLE ENGRAVED WITH MONTHS AND DAYS INNER LUAR VOLVELLE (LACKING) WITH STRING GNOMEN, THE FINELY BALANCED NEEDLE WITH BRASS CAP (REPLACEMENT), THE MOVING CURSOR AND APAER CARD PRINTED WITH THE NAMES OF MAJOR EUROPEAN CITIES AND TOWNS WITH LATITUDES, WITH FOLDING SILVERED BRASS LATITUDE ARM,THE UNDERSIDE WITH CALENDAR VOLVELLE SIGNED FAI'T PAR CHARLES BLOUD A DIEPPE FURTHER ENGRAVED ON THE LOWER FACE OF THE CASE WITH FOLIATE WHEAT EAR AND NEO-CLASSICAL DECORATION WITH TWO BRASS HOOKS AND EYES -- 4¼IN. (10.8CM.) LONG SEE ILLUSTRATION
THE COVER FURTHER ENGRAVED WITH A HORIZONTAL DIAL WITHIN A FOLIATE AND NEO CLASSICAL DECORATED BOARDER, THE INNER FACE OF THE COVER WITH LATITUDE SCALE TO ONE SIDE 0°- 80° AND WHITE METAL CALENDAR VOLVELLE ENGRAVED WITH MONTHS AND DAYS INNER LUAR VOLVELLE (LACKING) WITH STRING GNOMEN, THE FINELY BALANCED NEEDLE WITH BRASS CAP (REPLACEMENT), THE MOVING CURSOR AND APAER CARD PRINTED WITH THE NAMES OF MAJOR EUROPEAN CITIES AND TOWNS WITH LATITUDES, WITH FOLDING SILVERED BRASS LATITUDE ARM,THE UNDERSIDE WITH CALENDAR VOLVELLE SIGNED FAI'T PAR CHARLES BLOUD A DIEPPE FURTHER ENGRAVED ON THE LOWER FACE OF THE CASE WITH FOLIATE WHEAT EAR AND NEO-CLASSICAL DECORATION WITH TWO BRASS HOOKS AND EYES -- 4¼IN. (10.8CM.) LONG SEE ILLUSTRATION