From their site:
The Kinematic Models for Design Digital Library (KMODDL) is an open access, multimedia resource for learning and teaching about kinematics - the geometry of pure motion - and the history and theory of machines.
This is a goldmine for engineers, mechanics, inventors, automaton-makers, and robot enthusiasts. Resources include: models, tutorials, simulations, references, biographies, and resources for 3D reproductions.
I urge you to visit this impressive collection of 19th-century machine elements held by Cornell.
Labels: online resources