Nowadays, a commonwealth has come to mean any government in which all people involved have a say, or a loose formation of nations with a shared loyalty. It is also the official designation of a few states including, Kentucky, Massachusetts, Pennsylvania, and Virginia and some U.S. territories.
1 Pneumatic tools are powered by compressed air. 2  Common types of these air-powered hand tools that are used in industry include buffers, nailing and stapling guns, grinders, drills, jack hammers, chipping hammers, riveting guns, sanders and wrenches.
Another type of siege weapon was the trebuchet, which is a form of catapult, but the power source was different. The trebuchet used gravity and weights to hurl the projectile. The catapult used in the Middle Ages was powered by one of four different sources.These were tension, torsion, traction, and gravity.nother type of siege weapon was the trebuchet, which is a form of catapult, but the power source was different. The trebuchet used gravity and weights to hurl the projectile. The catapult used in the Middle Ages was powered by one of four different sources.