General Roy's Baseline :: Shared Description

In 1784 General Roy measured a base line between Hampton Poor House and King's Arbour on Hounslow Heath, a distance of just over 5 miles. This was a painstaking process: three rods of about 20 ft. were supported on trestles and the ends aligned to an accuracy of a thousandth part of an inch. The first rod was then carried to the end of the third, an operation to be repeated 1370 times. The final measurement gave the length of the base as 27404.01 ft. This measurement provided the baseline for the accurate mapping of the UK.
by N Chadwick
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2 images use this description:

TQ0776 : General Roy's Cannon by N Chadwick
TQ0776 : General Roy's Cannon by N Chadwick


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Created: Tue, 1 Sep 2020, Updated: Tue, 1 Sep 2020

The 'Shared Description' text on this page is Copyright 2020 N Chadwick, however it is specifically licensed so that contributors can reuse it on their own images without restriction.

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