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.
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, consisting of a brass tube 3-1/2 in. long with an aperture of 2-3/4 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 the copyright to the books of George Adams, and subsequently largely carried on the original business of the Adams instrument makers.
In The Journal of Andrew Ellicott its author describes this instrument as the first of "Two Acromatic Telescopes for Taking signals, with sliding tubes, one of them drew out to upwards of 4 feet, and the other to about 15 inches, the latter for its length is remarkably good, it shows the satellites of Jupiter very distinctly."
Deposit of Andrew Ellicott Douglass of Tucson, Ariz., in 1899. USNM 152082. Figure 73.
Telescope, draw type, made of brass with acromatic lens, length 11 in. Incomplete, and maker not known. The second of the instruments described in The Journal of Andrew Ellicott as an acromatic telescope. Used for taking signals, with sliding tubes, which draw out to about 15 in. It was considered to be remarkably good for its length, and showed the satellites of Jupiter very distinctly.
Gift of Andrew Ellicott Douglass of Flagstaff, Ariz., in 1931. USNM 152085.