Ballista
a machine used in military gree the purpose of the modern cannon. heavy missiles, thus serving in some degree the purpose of the modern cannon. obtained by the torsion of ropes, fibers, quarter of a mile, and to have thrown sometimes had an effective range of ers, The motive power appears to have been quarter of a mile, and to have thrown ballistic pendulum is an apparatus for ascertaining the velocity of military proascertaining the velocity of military projectiles, and consequently the force of fired gunpowder.