Fecit enim rotas circiter pedum duodenm et epistyliorum capita in medias rotas inclusit; eadem ratione cnodaces et armillas in capitibus inclusit: ita cum trientes a bubus ducerentur, in armillis inclusi cnodaces versabant rotas, epistylia vero inclusa uti axes in rotis eadem ratione, qua scapi, sine mora ad opus pervenerunt.
For he made wheels about twelve feet in diameter, and fixed the ends of the architraves in the middle of the wheels. In the same way he fixed pivots and sockets at the ends of the architraves. Thus when the frames of four-inch timber were drawn by the oxen, the pivots moving in the sockets turned the wheels, while the architraves being enclosed like axles in the wheels (in the same way as the shafts) reached the building without delay.
final_alignments\Vitruvius_Architecture_Book_10.json