Common Theodolite


Thomas Wright (about 1686–1767) was a prominent London maker who had gone into business for himself in 1718, after learning the trade from John Rowley. He traded at the sign of The Orrery & Globe, was appointed Mathematical Instrument Maker to His Royal Highness, George, Prince of Wales, and produced "all sorts of Mathematical Instruments for Sea & Land According to the best & latest Improvements." The title of Wright's royal appointment changed in 1727, when George II ascended to the throne. Wright retired from business in 1748. This elegant instrument has two open sights attached to the circle, and two on the alidade. The circle is graduated to degrees, and read by vernier to 5 minutes. It is signed "Made by Tho. Wright Instrumt Maker to Ye KING."

Ref: Gloria Clifton, Directory of British Scientific Instrument Makers 1550–1851 (London, 1995), p. 306.

Date Made: 1727-1748

Maker: Wright, 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.328867Catalog Number: 328867Accession Number: 278000

Object Name: circumferentor

Measurements: base plate: 12 in; 30.48 cmneedle: 4 1/2 in; 11.43 cmoverall; theodolite: 7 in x 12 in; 17.78 cm x 30.48 cmoverall; attachment: 5 7/16 in x 2 1/4 in x 1 1/2 in; 13.81125 cm x 5.715 cm x 3.81 cm


Record Id: nmah_747975

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