Great Ramsden Theodolite, 18th century

Great Ramsden Theodolite, 18th century

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: Great Ramsden Theodolite. This surveying device was built over a period of three years (1782-1785) by the British instrument maker Jesse Ramsden (1735-1800). It was used in the original surveying of the UK that led to the establishment of the Ordnance Survey. This artwork is from a 1799 report by Mudge and Dalby for the UK's Board of Ordnance. This report covered the years 1784-1796 of the survey being carried out in England and Wales. The theodolite was 91 centimetres across at the base, and is here mounted on a support structure.

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Keywords: 1700s, 1799, 18th century, an account of the operations, apparatus, artwork, astronomical, black-and-white, board of ordnance, british, cartographic, cartography, dalby, device, early, english, equipment, european, geographical, geography, historical, history, illustration, mapping, monochrome, mudge, ordnance survey, pioneering, surveying, technological, technology, theodolite, trigonometric, trigonometrical, trigonometrical survey, trigonometry, uk, united kingdom

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