Abaci latitudo ita habeat rationem, ut, quanta fuerit altitudo, tanta duo sint diagonia ab angulo ad angulum; spatia enim ita iustas habebunt frontes quoquoversus latitudinis.
The width of the abacus is to be so proportioned: the diagonal lines from angle to angle are to equal twice the height of the capital. Thus the front elevations in every direction, will have the right breadth.
final_alignments\Vitruvius_Architecture_Book_4.json