Circumferenter
National Museum of American History

Circumferenter

Unknown artist

overall brackets folded down: 2 5/8 in x 12 3/8 in x 3 5/8 in; 6.6675 cm x 31.4325 cm x 9.2075 cm
National Museum of American History
CC0 — Public Domain
National Museum of American History

James McCann, of Newmarket, Va., received a U.S. patent (#519) for a surveying instrument on Dec. 20, 1837. This is probably the model he submitted with his patent application.

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