An 18th Century Butterfield-type silver octagonal dial, signed on the horizontal plate Delure Paris, with folding bird gnomon with graduated latitude scale 40°-60°, the obverse plate engraved with hour scales IIII-XII-VIII, 5-12-7, V-XII-VII, with compass box(detached), blued iron needle and cap, the reverse engraved with the latitudes of twenty European cities, in velvet line fitted leather case - 3in.(8cm.)wide

细节

An 18th Century Butterfield-type silver octagonal dial, signed on the horizontal plate Delure Paris, with folding bird gnomon with graduated latitude scale 40°-60°, the obverse plate engraved with hour scales IIII-XII-VIII, 5-12-7, V-XII-VII, with compass box(detached), blued iron needle and cap, the reverse engraved with the latitudes of twenty European cities, in velvet line fitted leather case - 3in.(8cm.)wide