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



struments. 

 Nottingham: Benjamin Chandlee, Jr. (1723-1791); clocks and surveying in- 



struments. 



Chandlee & Bros. (fl. 1790-1791); clocks and surveying instru- 

 ments. 



Ellis Chandlee (1755-1816); surveying instruments and clocks. 



Ellis Chandlee & Bros. (fl. 1791-1797); clocks and surveying 

 instruments. 



Isaac Chandlee (1760-1813); surveying instruments and clocks. 



MASSACHUSETTS 



Boston: Jedidiah Baldwin (c. 1777-1829); surveying instruments. 



Aaron Breed (1791-1861); surveying instruments. 



Bartholomew Burges (fl. 1789); scientific instruments. 



Jere Clough (18th century); surveying instruments. 



John Dabney, Jr. (fl. 1739); mathematical instruments. 



Jonathan Dakin (fl. 1745); mathematical instruments and 

 balances. 



John Dupee (fl. after 1761); surveying instruments. 



Samuel Grainger (fl. 1719), practitioner. 



Stephen Greenleaf (1704-1795); mathematical instruments. 



Thomas Greenough (1710-1785); mathematical, surveying, as- 

 tronomical, and nautical instruments. 



William Greenough (fl. 1785); surveying instruments. 



Isaac Greenwood, Sr. (c. 1725-1 750), practitioner. 



Isaac Greenwood, Jr. (1730-1803); mathematical instruments. 



Benjamin K. Hagger (c. 1769-1 834); mathematical and surveying 

 instruments. 



James Halsie I (fl. 1674), practitioner. 



James Halsy II (1695-1767); mathematical and surveying 

 instruments. 



John Halsy (fl. 1700); mathematical instruments. 



Joseph Halsy (fl. 1697-1762); surveying instruments. 



Rowland Houghton (1678-1744); surveying instruments. 



Andrew Newell (1749-1798); surveying instruments. 



Joseph Newell (fl. 1800-1813); surveying instruments. 



Joseph Pope (1750-1826); scientific instruments and clocks. 



Nathan Prince (fl. 1743), practitioner; scientific instruments. 



Paul Revere (1735-1818); gunnery instruments. 



Charles Thacher (18th century); surveying instruments. 



Samuel Thaxter (1769-1842); surveying, nautical, and mathe- 

 matical instruments. 



William Williams (1737/8-1792); mathematical and nautical 

 instruments. 

 Brookfield: John Potter (1746-1818); surveying instruments. 



Hanover: John Bailey II (1752-1823); surveying instruments. 



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