Semi-Circumferentor Stamped 1810

Description:

Semi-Circumferentor Stamped 1810, with brass half-circle, punched divisions 0-90-0 on outer scale and 90-0-90 on inner scale, trough compass with steel needle (glass cracked),rotating alidade with twin folding sights and one (of two) clamps adjusted with wingnut, mahogany body with copper biding strips and brass rivets, and brass ball-and-socket staff mount, lg. 7 1/2 in. , in original carved wood cover and leather binding strips; and tripod.
Estimate $1,000-1,500

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