Explanation of the letters in this figure.

AD. The pulleys on the two columns.
B. The metal cover in which the wheel turns.
S. The wheel inside the cover.
F. The pumps on the cover.
D. The board that holds the water.
E. The river into which the water falls from the pump.

A device by which one can very easily remove earth from a trench with a horse.

The present copperplate print displays a device for us by which one can very easily [remove] the excavated earth and all refuse with a horse.