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Refracting Telescope

Refracting Telescope

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Description
This is a brass instrument on a pillar-and-tripod stand. It has an achromatic objective of 2.75 inches aperture and 57-inch focus. The “W. & S. Jones” signature refers to William and Samuel Jones, brothers who, beginning in 1791, sold a range of scientific and mathematical instruments from their shops on Holborn Hill in London.
The telescope belonged to Andrew Ellicott (1754-1820), an American surveyor and geodesist who determined longitudes by observing eclipses of the moons of Jupiter. He probably used this telescope for that purpose.
Ref: Andrew Ellicott, “Astronomical, and Thermometrical Observations, made on the Boundary between the United States and His Catholic Majesty,” Transactions of the American Philosophical Society 5 (1802): 203-311; also Ellicott, “Astronomical observations made at Lancaster, Pennsylvania, chiefly with a view to ascertain the longitude of that borough, and as a test of the accuracy with which the longitude made by found by lunar observation,” pp. 61-69.
Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851 (London, 1995), p. 155.
Location
Currently not on view
Object Name
telescope, refracting
telescope
maker
W. & S. Jones
place made
United Kingdom: England, London
Measurements
overall: 30 in x 60 in x 15 1/2 in; 76.2 cm x 152.4 cm x 39.37 cm
ID Number
PH.152082
catalog number
152082
accession number
116914
Credit Line
Andrew E. Douglass
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Astronomy
Data Source
National Museum of American History
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