Astronomical Instruments of the Imperial Observatory

A woodcut illustration depicts mechanical or surveying equipment in an outdoor setting. On the left, a large circular object, likely a wheel or component of a machine, is supported by a wooden tripod made of rough-hewn logs lashed together with rope. To the right stands a tall, vertical rectangular post with two adjustable sliding brackets or sights, labeled with the celestial stems Jia and Yi. The background shows a landscape with a low hill and small shrubs. The entire scene is enclosed within a double-line border.

Figure Forty-Nine

Bing

Jia

Yi