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.

Date Made: 1840s

Maker: Jones, Thomas

Location: Currently not on view

Place Made: United Kingdom: England, London

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping


Exhibition Location:

Related Publication: Clifton, Gloria and Gerard L. E. Turner. Directory of British Scientific Instrument Makers 1550-1851

Data Source: National Museum of American History

Id Number: PH.314634Accession Number: 208213Catalog Number: 314634

Object Name: theodolite

Measurements: overall: 13 5/8 in; 34.6075 cmhorizontal circle: 5 1/2 in; 13.97 cmvertical circle: 5 1/2 in; 13.97 cmtelescope: 10 1/4 in; 26.035 cmstriding level: 4 1/4 in; 10.795 cmoverall: 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


Record Id: nmah_747673

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