Quam magnae fuerint inter contignationem et imum libramentum altitudinis partes tres, quattuor a perpendiculo recedant et ibi conlocentur inferiores calces scaporum.
Taking the height between the floor above and the level below as three parts, let four parts be set off from the perpendicular and let the foot of the string be placed there.
final_alignments\Vitruvius_Architecture_Book_9.json