Two Engraved Brass Sectors, early to late 18th century, probably England, 9-in. example with calibration scales divided for lines, circles, and cubic measures, with astronomical symbols representing p

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Description

Two Engraved Brass Sectors, early to late 18th century, probably England, 9-in. example with calibration scales divided for lines, circles, and cubic measures, with astronomical symbols representing planets on each arm; the 6-in. example with engraved scales and calibrations, both with folding stabilizer bars, and central rule-joint hinge. Estimate...

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