Part 31

Benjamin Condy (fl. 1756, d. 1798); mathematical instruments and sand glasses.

William Davenport (1778-1829); surveying and mathematical instruments.

William Dean (?-1797); surveying and nautical instruments.

George Evans (fl. 1796, d. 1798); mathematical instruments.

Martin Fisher (fl. 1790); glass instruments.

Joseph Gatty (fl. 1794); barometers, thermometers, and philosophical instruments.

Bryan Gilmur (end of 18th century); mathematical instruments and clocks.

Thomas Godfrey (1704-1749); improved reflecting backstaff.

John Gould (fl. 1794); nautical, surveying, and optical instruments.

Theophilus Grew (fl. 1753), practitioner.

James Ham (fl. 1754-1764); mathematical instruments.

James Ham, Jr. (fl. 1780); mathematical instruments.

Alloysius Ketterer (fl. 1789); glass instruments.

Anthony Lamb (1703-1784); mathematical instruments.

Thomas Pryor (fl. 1778); mathematical instruments.

Benjamin Rittenhouse (1740-c.1820); surveying and astronomical instruments.

David Rittenhouse (1732-1796), practitioner; astronomical and surveying instruments.

Christopher Sower [Sauer] (c. 1724-1740); mathematical instruments and clocks.

Charles Taws (fl. 1795); mathematical instruments.

Henry Voight (1738-1814); clocks, watches, and astronomical instruments.

John Whitney (fl. 1801); mathematical and optical instruments.

Thomas Whitney (fl. 1798-1823); mathematical and optical instruments.

John Wood (fl. 1790); compasses.

Pittsburgh: Frederick A. Heisely (1759-1839); clocks and mathematical instruments.

West Bradford: Joel Baily (1732-1797), practitioner.

RHODE ISLAND

Newport: William G. Hagger (c.1744-1830?); quadrants.

King & Hagger (1759/60); mathematical and nautical instruments.