University of California
Ucmp: Leonardo's Contributions to Science
Information about Leonardo da Vinci's observations of the natural world. An insightful commentary on the scientific achievements of the Renaissance.
Museum of Science
Museum of Science: Leonardo's Visions of the Future
This site from The Museum of Science includes modern machines that Leonardo da Vinci first designed. Original sketches of Leonardo's machines also included.
Museum of Science
Museum of Science: Inventor's Toolbox: The Elements of Machines
Simple machines that were all in common use for centuries before Leonardo da Vinci's time, followed by devices that combine these in various ways.