Gilmur, Bryan (end of 18th century), Philadelphia; also made clocks. Greenleaf, Stephen (fl. 1745), Boston. Greenough, Thomas (1710-1785), Boston; also made surveying, astronomical, and nautical instruments. Greenwood, Isaac, Jr. (1730-1803), Boston. Hagger, Benjamin K. (c.1769-1834), Boston and Baltimore; also made surveying instruments. Halsy, James, II (1695-1767), Boston; also made surveying instruments. Halsy, John (fl. 1700), Boston. Ham, James (fl. 1754-1764), New York and Philadelphia. Ham, James, Jr. (fl. 1780), Philadelphia. Hamlin, William (1772-1869), Providence, R.I.; also made nautical and astronomical instruments. Heisely, Frederick (1759-1839), Frederick, Md., and Lancaster, Harrisburg, and Pittsburgh, Pa.; also made clocks and surveying instruments. Heisely, George (1789-1880), Harrisburg, Pa.; also made clocks. Hinton, William (fl. 1772), New York. Hooker & Fairman (before 1810), Newburyport, Mass. Jacks, James (fl. 1780's), Charleston, S.C.; also made surveying instruments. Jayne, John (late 18th century), Salem, Mass. King & Hagger (1759/60 to early 1760's), Newport, R.I.; also made nautical instruments. King, Benjamin (1707-1786), Newport, R.I.; also made nautical instruments. King, Daniel (1704-1790), Salem, Mass. King, Samuel (fl. 1786), Newport, R.I. Lamb, A. & Son (1780's), New York. Lamb, Anthony (1703-1784), Virginia, Philadelphia, New York, and Hunter's Key, N.Y.; also made surveying and nautical instruments. Lamb, John (1735-1800), New York; also made nautical and surveying instruments. Mendenhall, Thomas (fl. 1775), Lancaster, Pa.; also made clocks. Newell, Andrew (1749-1798), Boston; also made compasses and surveying instruments. Platt, Augustus (1809-1886), Columbus, Ohio; also made surveying instruments. Pryor, Thomas (fl. 1778), Philadelphia. Revere, Paul (1735-1818), Boston, Mass. Sibley & Marble (late 18th century), New Haven, Conn.; also made clocks and watches. Sower, Christopher (c. 1724-1740), Germantown and Philadelphia, Pa.; also made clocks. Taws, Charles (fl. 1795), Philadelphia. Thaxter, Samuel (1769-1842), Boston; also made surveying and nautical instruments. Walpole, Charles (fl. 1746), New York. Whitney, John (fl. 1801), Philadelphia; also made optical instruments. Whitney, Thomas (fl. 1798-1821), Philadelphia; also made optical and surveying instruments. Williams, William (1737/38-1792), Boston; also made nautical instruments. Witt, Christopher (fl. 1710-1765), Germantown, Pa.; also made clocks. NAUTICAL Bulmain & Dennies (fl. 1799), New York. Clark, Robert (fl. 1785), Charleston, S.C.; also made surveying and optical instruments. Condy, Benjamin (fl. 1756-92, d. 1798), Philadelphia; also made mathematical instruments. Davenport, William (fl. 1800-1820), Philadelphia; also made mathematical and surveying instruments. Dean, William (?-1797), Philadelphia; also made surveying instruments.