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The first Ramsden three-foot theodolite, 1790

The first Ramsden three-foot theodolite, 1790
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Largest available format 2241 × 2517 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 2241 × 2517 px 190 × 213 mm 759 KB
Medium 912 × 1024 px 77 × 87 mm 601 KB

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IMAGE number
UIS5079197
Image title
The first Ramsden three-foot theodolite, 1790
Auto-translated text View Original Source
Artist
Unknown
Location
Science Museum, London, UK
Medium
engraving
Image description

The first Ramsden three-foot theodolite, 1790. Engraved plate by Basire showing a section view of the theodolite used in the survey to connect the Paris and Greenwich Observatories. 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 by General Roy. Illustration from the 'Philosophical Transactions of the Royal Society', 1790. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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