brown leather covers, end opening, marked "And. Ellicott," 6/2 in. 

 by 8 in. by 2 in. First page has signature "Andrew Ellicott 1788." 

 Formerly the property of Ellicott's eldest daughter, Jane Judith 

 Ellicott, from whom it passed to her youngest son, William Reyn- 

 olds. It was inherited by the latter's son, John Reynolds of Mead- 

 ville. Pa., who presented it as a gift to the U.S. National Museum 

 in 1932. USNM 310417. Figures 70, 71. 



Pocket Slate Jji in. long and 4 in. wide, with wooden frame 7]^ in. 

 long and 4 in. wide. Slate 5% in. long and 2/2 in. wide. Part of 

 field equipment used by Ellicott. 



Gift of Charles Ellicott of Dansville, N.Y., in 1960. USNM 

 318292. 



Quadrant of brass made and used by Ellicott. Quadrant has a 

 radius of 12 in., is on a stand 17 in. high, and has the original lenses. 

 Simple construction with easy adjustment, accomplished by means 

 of two plumb lines. A tangent screw for slow motions was designed 

 and added in 1885 by Andrew Ellicott Douglass, Ellicott's grandson. 

 Instrument was made by Ellicott about 1790 and was used in run- 

 ning the southern boundary of the United States in 1796 and 1800, 

 and on other surveys. 



Deposit of Andrew Ellicott Douglass of Tucson, Ariz., in 1931. 

 USNM 152081. Figure 72. 



Surveying Instrument^ with brass disk 10^2 in. in diameter laid off 

 in degrees, minutes, and seconds with vernier points. Two tele- 

 scopes, one fixed and the other revolving. The instrument is 

 mounted on a tripod or Jacob's staff by means of a socket on the 

 underside. Complete with original painted pine case. The name 

 of the maker, "G. Adams London," is engraved on the dial. 



George Adams (1704-1773) was mathematical instrument 

 maker to King George III. After serving an apprenticeship from 

 1718, he made instruments for the East India Company in 1735 

 and 1736, and established a shop at "Tycho Brahe's Head" at the 

 corner of Raquet Court, Fleet Street. He specialized in terrestrial 

 and celestial globes and microscopes. Following his death he was 

 succeeded in business by his son George Adams the Younger 

 (1750-1795), who also served as mathematical-instrument maker 

 to the king. 



This instrument is believed by the donor to have been used by 

 either Andrew Ellicott or by his son-in-law David Bates Douglass. 



Gift of Charles B. Curtis of Litchfield, Conn., in 1945. USNM 

 312932. 



134 



