mesin perang telah memainkan peranan penting dalam kempen-kempen peperangan tentera Rom.Dengan teknologi yg diwarisi dr tamadun Greek,Rom telah berjaya membina pelbagai jenis mesin perang yang kebanyakannya bersifat projektil.
Disini diterangkan konsep asas dalam mekanisma senjata projektil ini.

Euthytone

Palintone

Perbandingan Jenis Rangka dengan Jenis Busur Panah



Rajah diatas menunjukkan mekanisma penting mesin perang ini.
Ia menggunakan 'cord bundles',dimana sebatang rod diletak diantara sebundle tali-tali dan dipusing.
Keterangan lebih detail
http://198.144.2.125/Siege/ConstructionPics.htm
http://198.144.2.125/Siege/Blueprints.htm
Roman Onager
Roman Ballista
Early Greek Catapulta
In Greek, oxybeles translates to mean “bolt shooter”, gastrophetes means “belly bow” in reference to how a man uses his weight from his belly to draw the bow, catapulta means “shield piercer”, and ballista generally means “projectile shooter” in which the projectile is typically a stone shot. The ballista may also be referred to as a lithobolos, or “stone thrower”.-Dari Siege Engine Blueprints