A 19th-Century French lacquered and ebonised-brass graphometer
A 19th-Century French lacquered and ebonised-brass graphometer, unsigned , the glazed compass with half-blued steel needle and clamp, eight points initialled in French and silvered circumference degree scale, the 8½-inch dia. semi-circle with 0-180° scale in both directions and two fixed sights, the alidade with twin sights and verniers, with a ball and socket joint and screw clamp to a staff mounting on the reverse
A 19th-Century French lacquered and ebonised-brass graphometer
A 19th-Century French lacquered and ebonised-brass graphometer, unsigned , the glazed compass with half-blued steel needle and clamp, eight points initialled in French and silvered circumference degree scale, the 8½-inch dia. semi-circle with 0-180° scale in both directions and two fixed sights, the alidade with twin sights and verniers, with a ball and socket joint and screw clamp to a staff mounting on the reverse
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
