"civ p.52 Staffae autem exterius spheram habent ferream, inferius vero triangulum. Idcirco permutante pede latus in triangulo contorquendo, in gyrum trahuntur spherae, prout fibulis pendent e staffilibus itaque contrahunt vel laxant fraenum mirabili celeritate." . "civ p.52 Staffae aut..." . .