Pivot, Compass pen with ruby point on a wooden base, with a rose. The rose has a brass cap in the middle with a hole for the pin at the bottom: the turning of the rose was improved by the materials used, while the rocking was reduced by increasing the rub's friction surface. 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., J.M. Kleman & Zoon (mentioned on object), 1825, wood (plant material), brass (alloy), iron (metal), ruby (mineral), agate (chalcedony), paper, pivot: h 15.2 cm
Keywords:
Pivot, Compass pen, ruby point, wooden base, rose, brass cap, middle, hole, pin, bottom, turning, improved, materials, rocking, reduced, increasing, rub's friction surface, badly damaged, rotated within, outer edge, scale, degrees, quadrant, arranged, compensate, magnetic variation, angle, actual north, magnetic north, second rose, type, cap, gem, agate, J.M, Kleman & Zoon, mentioned, object, 1825, wood, plant material, brass, alloy, iron, metal, ruby, mineral, chalcedony, paper, pivot
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