A mid 18th-Century Dutch brass circumferentor, signed and dated J.v. Wyk, Amsterd. 1759., the circle divided 0°-180° (X 2) with 4 fixed sights, the alidade engraved with 2 verniers, fitted with 2 fixed sights, (the compass missing), with suspension bracket and ring - 12 1/8ins. (30.8cm.) diameter. See illustration ex Christie's 19.11.87, lot 341
A mid 18th-Century Dutch brass circumferentor, signed and dated J.v. Wyk, Amsterd. 1759., the circle divided 0°-180° (X 2) with 4 fixed sights, the alidade engraved with 2 verniers, fitted with 2 fixed sights, (the compass missing), with suspension bracket and ring - 12 1/8ins. (30.8cm.) diameter. See illustration ex Christie's 19.11.87, lot 341
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