Philosopher, economist mathematician and French politician. Document signed as perpetual secretary of the Science Academy, Paris, June 11, 1777, 2 pages in-4. Certified true extract from the Science Academy records of February 22, 1771, giving a report of the roy and vandermonde on the essay on some m mechanical issues.
\Vandermonde and moy differens mechanical memories presented by Mr. Mathematics Professor under the title Dessay on some questions of mechanics, in this essay the author treats 1 ° of the effect of the currents on the blades. (2) the layout and dimensions of the various parts of the suction pumps. The manner of determining the power necessary to overcome the friction caused by one or more turns of rope around a fixed cylinder and that of such a hypotesis of friction that it will want.
As these various questions have already been examined by several learned geometricians, we will not undertake to make known here in detail the manner in which the author has solved them; we will content ourselves with observing that m. Henry has shown intelligence in the examination of this question and an extensive knowledge of the principles of mechanics, and in this respect deserves praise from the academy. In Paris, on the eleventh of June one thousand seven hundred and seventy-seven.
Of condorcet perpetual secretary of the academy. The item \The seller is \This item can be delivered anywhere in the world.