Mathematical Treasures - Gaspard Monge's Descriptive Geometry

This is the title page to the 1811 edition of the Descriptive Geometry of Gaspard Monge (1746-1818).  This book deals with methods for representing three-dimensional objects in two dimensions.  It was written to accompany Monge's courses at the Ècole Polytechnique in Paris. 

A page from Monge's book (plate 14) illustrating projections obtained by cutting a cone with an oblique plane.