Plan of the base measurement on Hounslow Heath, Summer 1784.

Plan of the base measurement on Hounslow Heath, Summer 1784.
1 9 c m
40cm
actual image size: 32cm x 11cm

Description

Plate taken from the summer, 1784 edition of 'Philosophical Transactions', a journal of the physical sciences and engineering. '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 William Roy of the Royal Engineers.

Image Details

Image Ref.
 
10318546

© Science Museum / Science & Society Picture Library

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