FIGURE VII.

In the present figure, one sees the craftsmanship of making a clock with very little effort. If one has running water in any small quantity, provided that it is perennial, it serves as a perpetual motor for this need. The two spheres C are vessels into which water enters through the small channel G. They are attached to the drum. On the side of A, the counterweight is attached to the drum B on the same side, which also serves as a marker D. While the two spheres are filling with water, they descend, marking the hours with the counterweight, as can be seen. Once the full spheres arrive at E, they pour into the channel E, emptying the water into the vessel F. Once they are empty, the counterweight brings them back up again. And thus, it turns forever. Take note that the thickness of the drum at A and B must be proportionate to the need, and likewise the counterweight D to the two spheres C, etc.

The Latin text mirrors the description, explaining a water-clock mechanism that utilizes the weight of filling vessels to act as a perpetual motor.

A technical illustration depicts a hydraulic clock featuring a large drum with spherical attachments and a horizontal water channel.