What French man did technical drawings of a buildings?
Charles-Louis Balzac Charles-Louis Balzac (1752 – 1820) was a French architect and architectural draughtsman.
Philbert Maurice d'Ocagne Philbert Maurice d'Ocagne (25 March 1862 – 23 September 1938) was a French engineer and mathematician. He founded the field of nomography, the graphic computation of algebraic equations, on charts which he called a nomogram.