An 18th-Century French brass graphometer
An 18th-Century French brass graphometer, signed Canivet a la Sphere AParis , the glazed compass with half-blued steel needle, eight-point windrose and raised circumference scale, with engraved and scroll-shaped supports within the 8¾-inch dia. semi-circle with 0-180° scales in each direction and twin sights, the alidade with twin sights and verniers, with a ball and socket joint and butterfly nut from a staff mounting on the reverse, and turned mahogany display stand
An 18th-Century French brass graphometer
An 18th-Century French brass graphometer, signed Canivet a la Sphere AParis , the glazed compass with half-blued steel needle, eight-point windrose and raised circumference scale, with engraved and scroll-shaped supports within the 8¾-inch dia. semi-circle with 0-180° scales in each direction and twin sights, the alidade with twin sights and verniers, with a ball and socket joint and butterfly nut from a staff mounting on the reverse, and turned mahogany display stand
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
