A fine early 18th-Century French lacquered-brass graphometer, signed on the limb N. Bion A Paris , the protractor scale graduated 0-180° in two directions, with gridlines numbered 6-60 in factors of six, the frame with foliate engraved crown and dolphin supports, the glazed compass with degrees around the circumference, wind rose, sixteen compass point initials and clamp ( glass cracked, needle missing ), the limb and alidade with four sights, the reverse with tripod or staff mounting with universal ball and socket joint and butterfly screw -- 14½in. (36.9cm.) wide See Colour Illustration and Detail
A fine early 18th-Century French lacquered-brass graphometer, signed on the limb N. Bion A Paris , the protractor scale graduated 0-180° in two directions, with gridlines numbered 6-60 in factors of six, the frame with foliate engraved crown and dolphin supports, the glazed compass with degrees around the circumference, wind rose, sixteen compass point initials and clamp ( glass cracked, needle missing ), the limb and alidade with four sights, the reverse with tripod or staff mounting with universal ball and socket joint and butterfly screw -- 14½in. (36.9cm.) wide See Colour Illustration and Detail
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
