Theater of Machines, Part 3

To ensure satisfaction, I will first describe various kinds of mill-works, and how they may be used in different places and at all times without water. For some can be prepared and used in places where there is no water at all due to the elevation, or where the water has dried up during great heat in hot or arid summers, or where it has frozen solid during a hard winter.

Others serve in the opposite case, where the waters are too great and would consequently drown the mill-work.

Some are also useful, indeed necessary, in sieges at fortresses where the enemy has cut off the water supply or has otherwise hindered the entrance and exit so that one can no longer grind according to the previous custom.