T. Jones Theodolite

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The "Thomas Jones, 4 Rupert St London" signature on this theodolite refers to Thomas Jones (1775–1852), an instrument maker who worked for Jesse Ramsden in London. Jones was elected a Fellow of the Royal Society of London in 1835. This is a very early example of a transit theodolite, and is one of several instruments that Jones made for the U. S. Coast Survey in the 1840s. The horizontal and vertical circles are silvered, and read by verniers and magnifiers to 30 seconds.
Ref: Gloria Clifton, Directory of British Scientific Instrument Makers 1550–1851 (London, 1995), p. 154.
Currently not on view
Jones, Thomas
place made
United Kingdom: England, London
overall: 13 5/8 in; 34.6075 cm
horizontal circle: 5 1/2 in; 13.97 cm
vertical circle: 5 1/2 in; 13.97 cm
telescope: 10 1/4 in; 26.035 cm
striding level: 4 1/4 in; 10.795 cm
overall: 13 1/2 in x 6 7/8 in x 9 3/4 in; 34.29 cm x 17.4625 cm x 24.765 cm
ID Number
accession number
catalog number
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History


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