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File:Roy 1790 Plate 01 Measurement of the Base with the Steel Chain.jpg

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Measurement of the Base with the Steel Chain

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English: Plate 1 from: Roy, William (1790). "An account of the trigonometrical operation, whereby the distance between the meridians of the Royal Observatories of Greenwich and Paris has been determined". Philosophical Transactions of the Royal Society of London 80: 111-614. Title: "For the account of the measurement of the base in Romney March eith the steel chainin the Autumn of 1787"
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Source https://archive.org/details/paper-doi-10_1098_rstl_1790_0015
Author Roy, William, 1726-1790

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