a b

n, m, S

Here a horse grinds the walnuts and gathers them under the millstones and draws the oil from the press and returns the crushed nuts to the fire. And it makes six barrels of oil a day, that is 4 brente. And it works thus: the pestle m goes up and down striking the wedge m, at the same time that the horse turns the millstones and crushes the walnuts. And at the same time the nuts are stirred at the fire, as you see, in the pan S. Now, when the wedge no longer drives in, fasten its pestle m to the little bell above, so that it is not touched by its mover, and detach the second pestle n and give it to the mover, which then strikes it upon the wedge n so many times that it unlocks and widens the whole instrument. Which instrument stands as is drawn above. And the said wedge that closes it is the wedge a, and that reversed wedge which opens the instrument is the wedge b.

Way of setting and pushing the olives back under the millstone.