chez Gauthier-Villars et Cie., à Paris, 1922. Original edition.
Printed wrappers, duodecimo, 68 pages, 20 b&w 20 figures.

Maurice d'Ocagne (1862–1938) was a French mathematician and engineer who revolutionized the field of graphical and mechanical computation
In 1894, he published Le Calcul Simplifié, which contained the first systematic classification of mechanical calculating machines.
He authored Vue d'ensemble sur les machines à calculer (Overview of Calculating Machines), a seminal work documenting the evolution of computational technology.
Nomography: He is best known for inventing the nomogram, a graphical calculating device that allows for the visual resolution of complex formulas without performing step-by-step arithmetic.

CONDITION: Good. (Wrappers have wear and some creasing at edges and corners, spine is missing 0.5 inch of paper at bottom end, repaired tears on spine.
Book store stamp on front endpaper.
The Contents are complete, clean and intact.
The binding is tight.)