Refracting Telescope (Comet Seeker)

This may be one of the “two forty-five inch Refractors” mentioned in a Georgetown publication of 1852. The achromatic objective has an aperture of 3.5 inches, and the brass tube is but 34 inches long, giving it a relatively short-focus and wide field of view. It has a brass pillar-and-tripod base, and wooden rods for adjustment in altitude and azimuth. It may have come from the shop of W. & S. Jones, 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.
date made
ca 1840
Physical Description
brass (overall material)
overall: 28 in x 16 1/2 in x 34 3/4 in; 71.12 cm x 41.91 cm x 88.265 cm
scope: 34 3/4 in x 4 in; 88.265 cm x 10.16 cm
ID Number
catalog number
accession number
Credit Line
Georgetown University
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History


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