Astronomical Instruments of the Imperial Observatory

A full-page technical engraving within a rectangular border depicts various types of mathematical or architectural instruments, likely proportional compasses or calipers. At the top, a large pair of calipers is shown with curved, circular handles at the top and long, straight legs that terminate in inward-curving, sharp points. The instrument is set against a background of a stylized landscape with rolling hills and small clusters of flowers or shrubs. In the lower section, there are three additional components: on the left, a single curved leg or hook-like tool with a rectangular upper section; in the center, a similar single curved leg or hook-like tool; and on the right, a second pair of compasses or calipers, partially visible, featuring more ornate, turned legs and a circular hinge mechanism at the top. The legs appear to have screw adjustments or scales.