Jones Refracting Telescope

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” signature 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.
Currently not on view
Object Name
mount, telescope
date made
ca 1840
W. & S. Jones
overall: 45 1/2 in x 9 in x 3 in; 115.57 cm x 22.86 cm x 7.62 cm
overall: 47 in x 4 1/2 in x 4 in; 119.38 cm x 11.43 cm x 10.16 cm
place made
United Kingdom: England, London
ID Number
catalog number
accession number
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Georgetown University
Additional Media

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