(1698 – 1758)

La Figure de la Terre, déterminée par les observations de Messieurs Bouguer, & de La Condamine, de l‘Académie Royale des Sciences, envoyés par ordre du Roi au Pérou, pour observer aux environs de l‘Equateur. Avec une Relation abrégée de ce voyage, qui contient la description du pays dans lequel les opérations ont été faites.

4° (258×195 mm). [24], CX, [2], 394, [2] pp. With engraved head-pieces by Eisen resp. Soubeyran, and 9 folding engraved plates. Contemporary mottled calf, spine gilt and with label. Corners slightly bumped. title abit foxed, toning in places. Erased stamp on title. Paris, Charles-Antoine Jombert, 1749.
BIBLIOGRAPHY: Norman 285; Sabin 6876; DSB II, p.343.
First edition of Bouguer‘s report on the geodetic expedition to Peru that was to measure an arc of the meridian near the equator. Bouguer‘s fellow scientists on the expedition were La Condamine, Godin and Jussieu. „The scientific result of the expedition was clear: the earth is indeed a spheroid flattened at the poles, as Newton had maintained. Bouger and La Condamine were unable, however, to agree on the joint publication of their works. Their long quarrel continued through a series of memoirs that were essentially mutual refutations of no scientific value; it ceased only with the death of Bouger in 1758″.“Bouguer‘s work on the expedition. was of high quality. Apart from the main geodetic program, he did an astonishing amount of other scientific work, measuring the dilatation of various solids by making use of the large range of temperatures found in the Cordillera, investigating the phenomena of atmospheric refraction and the measurement of heights with the barometer, devising a new type of ship‘s log, and undertaking a number of other researches, despite the very difficult physical conditions under which the geodetic measurements had to be carried out“ (DSB). [369032].