Figure 70.—Pages from manuscript "Journal and Astronomical Notebook" (USNM 310417) written by Andrew Ellicott while locating the boundary between the United States and the Spanish territory of Florida. These pages relate to the observations made in 1799 at the cord of the guide line on Mobile River for determining the latitude.
Figure 71.—Folding plate from Andrew Ellicott's "Journal and Astronomical Notebook" (USNM 310417), relating the results of observations made in February 1800 with the large and small sectors for determining Ellicott's position on St. Mary's River.
Formerly the property of Ellicott's eldest daughter, Jane Judith Ellicott, from whom it passed to her youngest son, William Reynolds. It was inherited by the latter's son, John Reynolds of Meadville, Pa., who presented it as a gift to the U.S. National Museum in 1932. USNM 310417. Figures 70, 71.
Pocket Slate 7-1/4 in. long and 4 in. wide, with wooden frame 7-1/4 in. long and 4 in. wide. Slate 5-3/4 in. long and 2-1/2 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 running 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 10-1/2 in. in diameter laid off in degrees, minutes, and seconds with vernier points. Two telescopes, 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.