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Portable transit instrument, 1799

IMAGE number
UIS5101502
Image title
Portable transit instrument, 1799
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
engraving
Image description

Portable transit instrument, 1799. Engraving. The Principal Triangulation of Britain was carried out by General William Roy of the Royal Engineers between 1787 and 1789, using theodolites designed and built by Jesse Ramsden (1735-1800). 'The Primary Triangulation of Great Britain' was a network of measured triangles across 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. Illustration from the first volume of 'An account of the operations carried on for accomplishing a trigonometrical survey of England and Wales' by William Mudge (1762-1820), published in London in 1799. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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Largest available format 2699 × 3508 px 2 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 2699 × 3508 px 229 × 297 mm 1.7 MB
Medium 788 × 1024 px 67 × 87 mm 985 KB

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