Before revision: For example, Heron of Alexandria ( c. 10 –75 AD) in his work Mechanics lists five mechanisms that can "set a load in motion": lever, windlass, pulley, wedge, and screw, and describes their fabrication and uses.
After revision: For example, Heron of Alexandria ( –75 AD) in his work Mechanics lists five mechanisms that can "set a load in motion": lever, windlass, pulley, wedge, and screw, and describes their fabrication and uses.