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 (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.