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. Ham, James, Jr. (fl. 1780), Philadelphia; also made mathematical instruments. Hamlin, William (1772-1869), Providence, R.I.; also made mathematical instruments. Jayne, John (late 18th century), Salem, Mass.; also made mathematical instruments. King & Hagger (1759/60 to early 1760's), Newport, R.I.; also made mathematical instruments. King, Benjamin (1707-1786), Newport, R.I.; also made mathematical instruments. King, Benjamin (1740-1804), Salem, Mass. King, Daniel (1704-1790), Salem, Mass.; also made mathematical instruments. King, Samuel (fl. 1786), Newport, R.I.; also made mathematical instruments. Lamb, A., & Son (1780's), New York; also made mathematical instruments. Lamb, Anthony (1703-1784), Virginia, Philadelphia, New York, and Hunter's Key, N.Y.; also made mathematical and surveying instruments. Lamb, John (1735-1800), New York; also made surveying and mathematical instruments. Newell, Andrew (1749-1798), Boston; also made mathematical instruments. Pease, Paul (fl. 1750), probably Rhode Island. Thaxter, Samuel (1769-1842), Boston; also made mathematical and surveying instruments. Warren, Benjamin (fl. 1740-1790), Plymouth, Mass.; also made surveying instruments. Williams, William (1737/38-1792), Boston; also made mathematical instruments. OPTICAL Benson, John (fl. 1793-1797). Clark, Robert (fl. 1785), Charleston, S.C.; also made nautical and surveying instruments. Sommer, Widow Balthaser (fl. 1753), New York. Whitney, John (fl. 1801), Philadelphia; also made mathematical instruments. Whitney, Thomas (fl. 1798-1821), Philadelphia; also made mathematical and surveying instruments. SURGICAL Bailey, John (fl. 1778), Fishkill, N.Y.; also made surveying instruments. Fosbrook, W. (fl. 1786), New York; also made dental instruments. Youle, James (1740-1786), New York. Youle, John (fl. 1786), New York. SURVEYING Bailey, John (fl. 1778), Fishkill, N.Y.; also made surgical instruments. Bailey, John, II (1752-1823), Hanover and Lynn, Mass. Baldwin, Jedidiah (c. 1777-1829), Salem, Boston, and Northampton, Mass., and Hanover, N.H. Biggs, Thomas (fl. 1792-1795), New York and Philadelphia. Blakeslee, Ziba (1768-1834), Newtown, Conn.