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Sir, The accurate knowledge of the dimensions and true figure of the earth is not a matter of mere curiosity. Astronomy and navigation are so closely connected with it, that the philosophers of the present century have pursued this enquiry through the most discouraging difficulties; and governments themselves have contributed considerable sums towards its success.

philosophical transactions of the royal society of london

VII. Considerations on the convenience of measuring an arch of the meridian, and of the parallel of longitude, having the observatory of Geneva for their common intersection. By Mark Augustus Pictet, Professor of Philosophy in the Academy of Geneva; in a letter to Sir Joseph Pictet, Bart. P. R. S