Astronomical Instruments of the Imperial Observatory

A woodcut illustration depicting various woodworking or construction tools and structures in an outdoor setting. On the left, a tall vertical wooden post stands with a curved top and a sliding adjustable bracket or gauge near the base, secured with a screw. To the right, a tripod-like structure made of rough-hewn logs is lashed together with rope, supporting a horizontal beam. Below this structure, a woven mat or platform lies on the ground. In the foreground, a small mallet and a square tool are visible. The background shows a simple horizon line with sparse tufts of grass.