Per media autem spatia tignorum insecantur exciduntur formae, in quibus excisionibus cluduntur capitula catapultarum, cuneisque distinentur, ne in contentionibus moveantur.
Now in the middle parts of the beams, rebates are cut and hollowed out. In these hollows, the frames of the catapults are fitted, and kept apart by wedges to prevent their moving when the ropes are stretched.
final_alignments\Vitruvius_Architecture_Book_10.json