T. Jones Theodolite

T. Jones Theodolite

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Description
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.
Location
Currently not on view
Object Name
theodolite
date made
1840s
maker
Jones, Thomas
place made
United Kingdom: England, London
Measurements
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
PH.314634
accession number
208213
catalog number
314634
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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