Pivot and Two Compass Cards, Compass pen with ruby point on a wooden base, with rose. The rose has a brass cap in the center with a hole for the pin at the bottom: the turning of the rose was improved by the materials used, while the oscillation was reduced by increasing the friction surface of the ruby. The rose, which is badly damaged, can be rotated within an outer edge, on which a scale in degrees per quadrant is arranged, this was to compensate for the magnetic variation (the angle between the actual north and the magnetic north). The second rose is of the same type, but the cap has a gem, probably agate. With two compass roses., J.M. Kleman & Zoon (mentioned on object), 1825, wood (plant material), brass (alloy), iron (metal), ruby (mineral), agate (chalcedony), paper, (A): h 15.2 cm (B): d 24.4 cm (C): d 21.7 cm
Keywords:
Pivot, Two Compass Cards, Compass pen, ruby point, wooden base, rose, brass cap, center, hole, pin, bottom, turning, improved, materials, oscillation, reduced, increasing, friction surface, ruby, badly damaged, rotated within, outer edge, scale, degrees, quadrant, arranged, compensate, magnetic variation, angle, actual north, magnetic north, second rose, type, cap, gem, agate, two compass roses, J.M, Kleman & Zoon, mentioned, object, 1825, wood, plant material, brass, alloy, iron, metal, mineral, chalcedony, paper, A
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