Gilman, Benjamin C. (1763-1835), Exeter, N.H.; also made mathematical instruments.
Gilmur, Bryan (fl. end of 18th century), Philadelphia; also made mathematical instruments.
Harland, Thomas (1735-1807), Norwich, Conn.; also made surveying instruments.
Heisely, Frederick A. (1759-1839), Frederick, Md.; also made mathematical and surveying instruments.
Heisely, George (1789-1880), Harrisburg, Pa.; also made mathematical instruments.
Hoff, George (1740-1816), Lancaster, Pa.; also made surveying instruments.
Huntington, Gurdon (1763-1804), Windham, Conn., and Walpole, N.H.; also made surveying and other instruments.
Kennard, John (1782-1861), Newmarket, N.H.; also made surveying instruments.
Mendenhall, Thomas (fl. 1775), Lancaster, Pa.; also made mathematical instruments.
Miller, Aaron (fl. 1748-1771), Elizabethtown, N.J.; also made compasses and surveying instruments.