Theater of Machines, Vol. 6

entirely from the city trench or another trench.

For first, the horse makes the wheel V revolve, with the wooden beam or hand-lever X to which it is harnessed, and which wood is attached below at the shaft of the aforementioned wheel. Through this it is caused that the rope, which is wound around the wheel, unwinds at one end while it winds itself up at the other: And because two carts are tied to both ends, as can be seen here by the letters O. I., thus one goes down into the trench while the other [comes up] through this movement, and they lead the earth out one after the other in this manner, and with the help of the two pulleys E. A., and they pull such [load] over the double bridge Y., as can be clearly noted from the diagram.