Pappus Alexandrinus Mathematical Collection, Book 8 1970, tr. D. Jackson  

Translation Pappus's introduction to the science of Mechanics in which he mentions the Science of the Centre of Gravity, how great Weight is raised witha small Amount of Power, how two Lines are produced in continued Proportion beween two Lines, how a Circle is drawn which is equal to the Circle of a Cylinder of unknown Base and other Geometrical Matters besides, which are needed by Carpenters. He (also) mentions in it the five Powers by which Weight is lifted. God is allknowing and allwise.
Section 1