Category
page 1Rotating machines
drill
thumb|A hand-held corded electric drill
thumb|A lightweight magnetic-mount drill
Archimedes' screw
machine used for transferring water from a low-lying body of water into irrigation ditches
Geneva drive
mechanism that transforms continuous rotation into an intermittent rotary motion
centrifugal governor
mechanism for automatically controlling the speed of an engine
mixing
process of mechanically manipulating a heterogeneous mixture to make it more homogeneous

bookwheel
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