Ellicott, Andrew (1754-1820), Baltimore; also made astronomical instruments.
Ford, George, I (late 18th century to 1840), Lancaster, Pa.; also made nautical instruments.
Ford, George, II (fl. 1842), Lancaster, Pa.; also made nautical instruments.
Gould, John (fl. 1794), Philadelphia; also made nautical and optical instruments.
Greenough, Thomas (1710-1785), Boston, also made nautical and mathematical instruments.
Greenough, William (fl. 1785), Boston.
Halsy, James, II (1695-1767), Boston; also made mathematical instruments.
Halsy, Joseph (fl. 1697-1762), Boston.
Hagger, Benjamin K. (c. 1769-1834), Boston and Baltimore; also made mathematical instruments.
Hanks, Benjamin (1755-1824), Mansfield and Litchfield, Conn.