Abstract
THE idea of prolonging the French arc of meridian to Sahara by the direct trigonometrical junction of Spain and Algeria, an idea of undoubted scientific value, presented itself to the mind of Captain Perrier when he was collecting the preliminary materials for the survey of Algeria. That survey was begun at the same time as the conquest, in the middle of military operations.
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CORNU, M. Captain Perrier's Geodetic Operations in Algeria . Nature 7, 450–451 (1873). https://doi.org/10.1038/007450a0
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DOI: https://doi.org/10.1038/007450a0