This is one of the “two forty-five inch Refractors” mentioned in a Georgetown publication of 1852. It has a brass pillar-and-tripod base, an equatorial mount, and mahogany handles for adjustments in right ascension and declination. The (missing) achromatic objective had an aperture an 3.5 inches. The brass tube is 42½ inches long. The “W. & S. Jones” inscription refers to a London firm that, from 1791 to 1859, sold a wide range of scientific and mathematical instruments.
Ref: Annals of the Astronomical Observatory of Georgetown College, D.C. 1 (1852), p. 14.
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