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Circumferenter
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
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.
National Museum of American History’s own descriptionSubjects
Credit lineCircumferenter. National Museum of American History. CC0.
