J. Hale Circumferentor, 9-in. dia. outer silvered scale calibrated in four quadrants, two hinged sighting vanes, with vernier from 30-0-30, 4-in. dia. central compass marked "J. Hale./Maker/Patd. Mar. 10 1886," housed in its original fitted box with two additional stationary vanes, lg. 13 in.
Provenance: Robert Miller Collection.
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