The page shows significant aging, including brown spots known as foxing, water staining, and a prominent vertical crease running through the center of the paper.

GENERAL

THEATER

OF MACHINES

General Theater of Machines original: "Theatrum Machinarum Generale." In the context of 18th-century publishing, a "Theater" was not a stage for acting, but a comprehensive, encyclopedic survey that "put on display" the entirety of a subject—in this case, the world of mechanical engineering.

machine original: "machina." In Leupold’s era, this term referred to any device that assisted in performing work, ranging from simple tools like levers and pulleys to the most complex clockwork and hydraulic engines.