LEBESGUE, Leçons sur les contructions trigonométriques, 1950

First edition.
Henri Lebesgue (1875-1941), is one of the great French mathematicians of the first half of the twentieth century. He is recognized for his theory of integration and for his theory of measurement, which extends the important early work of Émile Borel.

His lessons on geometric constructions repeat the courses given in 1940-1941 at the Collège de France.