Note 1047 — Chapter VIII · THEATRE (continued).
Reading edition
Vitruv. v. 6. Antiq. of Ath. by Cockerell, Donaldson, &c. p. 39. Tectum porticus quod est in summa gradatione, respondet Sienæ altitudinem, ut vox crescens æqualiter ad summas gradationes et tectum perveniat. Buleng. de Theat. c. 17.