"Le Calcul Par Le Trait" explores the elements and applications of calculation by drawing, focusing on measuring lines, surfaces, and cubes. Authored by Barthélemy Édouard Cousinéry, this historical work delves into graphical interpolation and the determination, on the drawing board, of the thickness of retaining walls and the abutment walls of vaults. The book offers insights into historical methods of technical drawing and architectural design. It is a valuable resource for those interested in the history of mathematics and architectural techniques.

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