File:Roy map of proposed triangulation between London and Paris, Published 1787.png

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Map of cross-channel triangulation

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Description
English: Map of cross-channel triangulation to determine the distance between the Royal Observatories of Greenwich and London. From: Roy, William (1787). "An Account of the Mode Proposed to be Followed in Determining the Relative Situation of the Royal Observatories of Greenwich and Paris". Philosophical Transactions of the Royal Society of London 77: 188-469.
Date
Source https://archive.org/details/jstor-106720
Author William Roy (1726-1790)

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