Theatrum instrumentorum et machinarum Iacobi Bessoni Delphinatis ...

NORTHERN LINE.

Figure One.

A technical engraving showing a large screw mechanism, a pair of dividers, a straight edge, and a spiral-shaped tool or component. The central element is a large threaded screw with a corresponding nut below it. To the left is a tool with a spiral end and a square-profile shaft. To the right is a pair of dividers positioned next to a rectangular bar.

WESTERN LINE. EASTERN LINE.

SOUTHERN LINE.