T. Jones Theodolite

T. Jones Theodolite

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This early example of a transit theodolite was made for the U. S. Coast Survey in the 1840s. The "Thomas Jones, 4 Rupert St London" inscription refers to Thomas Jones (1775–1852), an instrument maker who worked for Jesse Ramsden, and who was elected a Fellow of the Royal Society of London in 1835.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
Object Name
date made
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
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
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