Walpole: Gurdon Huntington (1763-1804); clocks and surveying and other instruments. NEW JERSEY Elizabeth: Aaron Miller (fl. 1748-1771); surveying instruments, clocks, and compasses. Wistarburg: Richard Wistar (fl. 1752); glass and thermometric instruments. NEW YORK Fishkill: John Bailey (fl. 1778); surveying and surgical instruments. New York: Thomas Biggs (fl. 1792); surveying instruments. Bulmain & Dennies (fl. 1799); nautical instruments. H. Caritat (fl. 1799); astronomical prints. John Donegan (fl. 1787); barometers, thermometers, and philosophical instruments. W. Fosbrook (fl. 1786); surgical and dental instruments. Joseph Gatty (fl. 1794); barometers, thermometers and philosophical instruments. James Ham (fl. 1754-1764); mathematical instruments. William Hinton (fl. 1772); mathematical instruments. A. Lamb & Son (fl. late 18th century); mathematical instruments. Anthony Lamb (1703-1784); mathematical instruments. John Lamb (1735-1800); mathematical instruments. M. Morris (fl. 1785); protractors. Widow Balthaser Sommer (fl. 1753); optical instruments. Charles Walpole (fl. 1746); mathematical instruments. James Youle (1740-1786); surgical instruments. John Youle (fl. 1786); surgical instruments. OHIO Columbus: Augustus Platt (1793-1886); mathematical instruments. Benjamin Platt (1757-1833); surveying instruments and clocks. Gallipolis: Joseph (fl. 1792) and Francois Devacht; watches, compasses, and sundials. PENNSYLVANIA Bucks County: W. L. Potts (late 18th century); surveying instruments. George Wall, Jr. (fl. 1788); surveying instruments. Germantown: Christopher Sower (c. 1724-1740); mathematical instruments and clocks. Christopher Witt (fl. 1710-1765); mathematical instruments and clocks. Harrisburg: Frederick A. Heisely (1759-1839); clocks and mathematical instruments. George Heisely (1789-1880); clocks and mathematical instruments. Lancaster: George Ford (late 18th century to 1842); surveying and nautical instruments.