Si enim altitudo contignationis ab summa coaxatione ad imum libramentum divisa fuerit in partes tres, erit earum quinque in scalis scaporum iusta longitudine inclinatio.
For if the height of a story from the flooring above to the level below is divided into three parts, five such parts will give the inclined string of the staircase in its exact length.
final_alignments\Vitruvius_Architecture_Book_9.json