Tunc in eo loco, qui locus dividit quattuor et dimidiam et tres et dimidiam partem, centrum oculi; signeturque ex eo centro rotunda circinatio tam magna in diametro, quam una pars ex octo partibus est.
Then that point which divides the four and a half and the three and a half is the centre of the eye of the volute: and let there be drawn from that centre a complete circle with a diameter of one part out of the eight parts.
final_alignments\Vitruvius_Architecture_Book_3.json