Plannen voor een bastion met behulp van een meetplank 1690

"Plannen voor een bastion met behulp van een meetplank" (Plans for a bastion using a measuring rod) is a technical drawing by Sébastien Leclerc I from 1690, currently housed in the Rijksmuseum. The drawing demonstrates the use of geometry in fortification design, a critical aspect of military engineering in the 17th century. The upper portion depicts various geometric shapes, while the lower portion illustrates a fortification plan with labeled points and lines representing measurements and angles, showcasing the application of geometry in practical military engineering. This drawing serves as a valuable historical document for understanding the technical aspects of fortification during Leclerc’s time.