Ita navis cum habuerit impetum aut remorum aut ventorum flatu, pinnae, quae erunt in rotis, tangentes aquam adversam vehementi retrorsus inpulsu coactae versabunt rotas; eae autem involvendo se agent axem, axis vero tympanum, cuius dens circumactus singulis versationibus singulos secundi tympani dentes inpellendo modicas efficit circuitiones.
When, therefore, the ship receives an impulse from the force of the oars or the sails, the paddles fixed to the wheels touch the water which meets them, and being urged by a strong backward impulse, turn the wheels. These in turn move the axle by their revolutions; and the axle moves the drum, the tooth of which being driven round, strikes at each revolution a single tooth of the second drum, and produces the corresponding rotations.
final_alignments\Vitruvius_Architecture_Book_10.json