Doolittle, Enos (1751-1806), Hartford, Conn.; also made surveying instruments, directional compasses and clocks.
Emery, Samuel (1787-1882), Salem, Mass.
Fairman, Gideon (1774-1827), Newburyport, Mass.; also made mathematical instruments.
Ford, George, I (late 18th century to 1840), Lancaster, Pa.; also made surveying instruments.
Ford, George, II (fl. 1842), Lancaster, Pa.; also made surveying instruments.
Godfrey, Thomas (1704-1749), Philadelphia.
Gould, John (fl. 1794), Philadelphia; also made surveying and optical instruments.
Greenough, Thomas (1710-1785), Boston; also made mathematical and surveying instruments.
Hagger, William G. (c.1744-1830?), Newport, R.I.
Ham, James (fl. 1754-64), New York and Philadelphia; also made mathematical instruments.