FIGURE IV.

In the following fourth figure, one can see a mechanism for crushing gunpowder, or other materials. It is assumed that the motor for this can be a man or another animal turning the pinion B. This strikes the wheel A, which is fixed upon the axle above two supports. With the drum D, where two wooden pegs are fixed, they catch and lift the two pins C and E underneath as they turn. These are fixed into the handles L and M of the pistons F and G, and respectively into their mortars H, where the receptacles for the materials to be worked are located.

The Latin text mirrors the description, outlining a machine for grinding gunpowder or other materials, operated by an animal or a man using a pinion and drum mechanism to actuate vertical pistons within mortars.