Penny Cyclopaedia of the Society for the Diffusion of Useful Knowledge Volume 5

Penny Cyclopaedia of the Society for the Diffusion of Useful Knowledge Volume 5

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1836 edition. Excerpt: ...the French and Spanish commissioners, as well as between Bouguer and La Condamine. The former, who felt that he was the main resource of the expedition, suspected that the latter woull appropriate an undue share of the merit to himself. The consequence was however of no harm to the real objects of the expedition, but perhaps rather the contrary; for it caused Bouguer, La Condamine, and the Spaniards George Juan and Antonio de Ulloa to conduct their operations separately, while the near accordance of the three in their results was a favourable presumption for their accuracy. The results did not differ from their average by a five-thousandth part of the whole, in the length of a degree of the meridian. The leisure which impediments occasionally gave enabled Bouguer to apply himself to the determination of points not immediately connected with the main object. Among other things, he ascertained the amount of refraction at considerable heights above the sea. He found reason to suspect the effect of the attraction of Chimboraco upon the plumb-line, but not knowing the mean density of the mountain, could not perform the task which Maskelyne afterwards undertook. attraction. A part of the observations (on the obliquity of the ecliptic) were forwarded as soon as made to Halley, who published them in 1739 in England: but an account of the whole was published in Paris, in 1740, under the title of' Figure de la terre, ' &c. In 1752 followed a justificatory tract on several disputed points; in 1753 a treatise on navigation, abridged in octavo by Lacaille in 1769, and reprinted in 1781 and in 1792, with notes by Lalande. In 1754 Bouguer published an attack on La Condamine, relative to the part of the great survey claimed by both. The latter replied...show more

Product details

  • Paperback | 788 pages
  • 189 x 246 x 40mm | 1,379g
  • Rarebooksclub.com
  • United States
  • English
  • Abridged
  • abridged edition
  • black & white illustrations
  • 1236987713
  • 9781236987716