Surveying Method for Floor Plans

The image is a black-and-white line drawing on paper showing a method for geometric measurement. A thick, textured rope forms the perimeter and central diagonal of an irregular quadrilateral shape, with the ends of the rope curling loosely at the top and bottom right. A thin straight line extends horizontally from the left, meeting the vertices of the shape, providing a reference for the surveying technique.

This diagram belongs to the tradition of early modern practical geometry and the manual labor of surveying. It relates to 17th-century mathematical treatises aimed at architects, builders, and military engineers concerned with land measurement and site planning.