IX  Transfertur nunc cogitatio scripturae ad rationem non inutilem sed summa sollertia a maioribus traditam, qua in via raeda sedentes vel mari navigantes scire possimus, quot milia numero itineris fecerimus.
Our next specification concerns a contrivance not without its uses, which we owe to the great skill of our predecessors. By this contrivance, whether we travel on land in a four-wheeled carriage, or by sea in a ship, we can learn how many miles we have covered.
final_alignments\Vitruvius_Architecture_Book_10.json