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For every problem, there is one solution which is simple, neat, and wrong.
H.L. Mencken (1880-1956)
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.