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Topic: Girard Desargues

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	Epicycloid - LoveToKnow 1911 (Site not responding. Last check: 2007-11-01)
		The locus of any other carried point is an "epitrochoid" when the circle rolls externally, and a "hypotrochoid" when the circle rolls internally.
		The epicycloid was so named by Ole Romer in 1674, who also demonstrated that cog-wheels having epicycloidal teeth revolved with minimum friction (see Mechanics: Applied); this was also proved by Girard Desargues, Philippe de la Hire and Charles Stephen Louis Camus.
		Epicycloids also received attention at the hands of Edmund Halley, Sir Isaac Newton and others; spherical epicycloids, in which the moving circle is inclined at a constant angle to the plane of the fixed circle, were studied by the Bernoullis, Pierre Louis M. de Maupertuis, Francois Nicole, Alexis Claude Clairault and others.
	www.1911ency.org /E/EP/EPICYCLOID.htm (734 words)

	Geometry.Net - Philosophers: Pascal Blaise (Site not responding. Last check: 2007-11-01)
		Extractions: Pascal, Blaise (1623 ñ 1662) By Eddie Yuen Blaise Pascal was born in Clermont The young Pascal began to participate with his father in Mersenneís Circle, a weekly discussion group of scientists and mathematicians.
		In this plantation of intellects, he learned from Girard Desargues, who had just published a projective geometry book but was not well received because of the difficult vocabulary and style.
		Pascal was one of the few to appreciate his work.
	www.889.com /philosophers/pascal_blaise.php (2801 words)

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