Mémoires sur la fortification perpendiculaire
This is a French military engineering treatise on fortification, published in Paris in 1786 by Nyon l'aîné and compiled by Charles-René Fourcroy de Ramecourt for the royal corps of engineers. Its copperplate plans show star-shaped bastions, ditches and ramparts drawn in precise plan view. A designer could draw on the geometric, zigzagging layouts for patterns, tessellations or architectural diagram motifs.
