Figure 72. — Brass quadrant made by Andrew Ellicott about 1790 and used for 

 running the southern boundary of the United States about 1796 and 1800, 

 and on later surveys. USNM 152081. 



Telescope y consisting of a brass tube 3^2 in. long with an aperture 

 of 2% in.; on its original brass tripod, with a serviceable altazimuth 

 mounting. Late 18th century. Made by "W. & S. Jones/135 

 Holborn/London." 



The firm of "W. & S. Jones" was a partnership of two brothers, 

 Samuel and William Jones, opticians, who worked at 30 Lower 

 Holborn and at 135 Holborn in London, from 1793. They bought 



135 



