Rotating machines

thumb|A hand-held corded electric drill thumb|A lightweight magnetic-mount drill

machine used for transferring water from a low-lying body of water into irrigation ditches

mechanism that transforms continuous rotation into an intermittent rotary motion

mechanism for automatically controlling the speed of an engine

process of mechanically manipulating a heterogeneous mixture to make it more homogeneous

thumb|right|Bookwheel, from Agostino Ramelli's Le diverse et artificiose machine, 1588 The bookwheel (also written book wheel and sometimes called a reading wheel) is a type of rotating bookcase that allows one person to read multiple books in one location with ease. The books are rotated vertically similar to the motion of a water wheel, as opposed to rotating on a flat table surface. The design for the bookwheel originally appeared in a 16th-century illustration by Agostino Ramelli at a time when large books posed practical problems for readers. Ramelli's design influenced other engineers an