Turrem autem minimam ait oportere fieri ne minus altam cubitorum lx, latitudinem xvii, contracturam autem summam imae partis quintam, arrectaria in turris in imo dodrantalia, in summo semipedalia.
He says that the smallest tower should be 60 cubits high and 17 broad, and that it should be contracted at the top, by 1/5 of the width at the foot. The uprights for the towers should be 9 inches at the bottom and 6 inches at the top.
final_alignments\Vitruvius_Architecture_Book_10.json