Rene Descartes

Born: 1596, La Haye, France Died: 1650, Stockholm

Descartes used his analytical geometry to lay down the mathematical principles for the axial monochromatic correction of images in both mirror and lens systems. This established all forms of the classical reflector (parabolic primary). (Courtesy Deutsches Museum, Munich)

No portrait of Cassegrain is known. The biographical details given in the original edition, taken from Robert "Dictionnaire des Noms Propres", were incorrect, due apparently to a confusion between Cassegrain and J. D. Cassini. New historical research by A. Baranne and F. Launay has revealed at last definitive information on the indentity of Cassegrain.*

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