Biography of Denis Henrion (?-1640)

French mathematician, died in Paris around the year 1640. He was one of the first translators of Euclid, and one of those unveiled in France the theory of logarithms invented by Neper. His main works are: translations of Euclid; Treaty of spherical triangles; Cosmography; Treaty of logarithms; Use of the mecometro; Use of the compass of proportion. He worked as an engineer for the Prince of Orange.