Ita cum cccc ab pinnis rotae fuerint versatae, semel tympanum circumactum inpellet dente, qui est ad latus fixus, plani tympani dentem.
Thus when the wheels have been made to revolve 400 times by the paddles, the drum being once driven round will strike by the tooth placed on its side, a tooth in the horizontal drum.
final_alignments\Vitruvius_Architecture_Book_10.json