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2021-01-06 06:56:07
[Juan y Santacilia, Jorge]; [Ulloa, Antonio de]; [Torres Villarroel, Diego de]; [Newton, Isaac]
18th-Century Manuscript On the Spanish Role in the French Geodesic Mission, and the Figure of the Earth
[Spain], 1752. 18th-century manuscript. Text in Spanish. 24 handwritten pages in ink, in three different hands. Later binding of blank paper using old material. Tiny wormholes at the lower edge of the pages on the first 7 leaves, not affecting the legibility. Occasional foxing, ink ghosting. Water stains on the last 2 leaves. Overall in fine condition.. 18th-century manuscript. Text in Spanish. 24 handwritten pages in ink, in three different hands. ff [12]. 18th-Century Spanish manuscript about the Spanish involvement in the French Geodesic Mission of 1735 and the Ellipsoid Model of the Earth. The manuscript is an interesting collection of contemporary reports proving the importance of the Spanish role performed by Jorge Juan y Santacilia and Antonio de Ulloa in the so-called French Geodesic Mission (1735), with a particular focus on the polemic over the shape of the Earth. The quotations are conjugated with connecting texts by an anonymous author. One of the important scientific disputes of the late 17th, early 18th century was the debate on the shape of the Earth. The assumption of the spherical shape was dominating until the late 17th century when Sir Isaac Newton determined that the Earth was oblate, a spheroid stretched over the Equator, however at the same time Giovanni Domenico Cassini, and his son Jacques, supposed that the Earth was prolate (stretched along the poles). Eventually, in 1735 two expeditions were sent by Louis XV and the French Academy to the Arctic Circle (Lapland) and to the Equator (Ecuador and Peru) to gain certainty by measuring the me … [Click Below for Full Description]
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