
2 6 c m
40cm
actual image size: 32cm x 18cm
Description
Telescope used by General William Roy during the time he carried out his ground-breaking survey of Britain from 17for measuring base line to link Paris and Greenwich, with box. Collar engraved with inscription R S 53. The principal triangulation of Britain was a surveying project undertaken between 1787 and 1790 by General William Roy, to link the observatories of Greenwich and Paris, using theodolites made by Jese Ramsden (1735-1800). 'The Primary Triangulation of Great Britain' was a network of measured triangles acros the country, to underpin the first general survey of the country. The network was checked in a number of places by setting up a baseline, several miles long, and comparing measured and calculated dimensions. The first line was used on Hounslow Heath, London, in 1784 by General William Roy of the Royal Engineers.
Image Details
Image Ref.
10279286
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