Sin autem amplior erit magnitudo theatri, tunc altitudo dividatur in partes iiii, uti tres efficiantur regiones cellarum transverse designatae, una harmoniae, altera chromatos, tertia diatoni.
But if the theatre is larger, then the height is to be divided into 4 parts, so that three lines of cavities are drawn crosswise, one enharmonic, a second chromatic, the third diatonic.
final_alignments\Vitruvius_Architecture_Book_5.json