Tympani autem, quod est in fastigio, altitudo sic est facienda, uti frons coronae ab extremis cymatiis tota dimetiatur in partes novem et ex eis una pars in medio cacumine tympani constituatur, dum contra epistylia columnarumque hypotrachelia ad perpendiculum respondeant.
The height of the tympanum which is in the pediment is to be such, that the whole front of the cornice from the outside of the cymatia is to be measured into nine parts; and of these one is to be set up in the middle for the summit of the tympanum. The architraves and hypotrachelia of the columns are vertically under it.
final_alignments\Vitruvius_Architecture_Book_3.json