The Kinematic Models for Design Digital Library is an amazing online museum of mechanisms

The Kinematic Models for Design Digital Library (KMODDL) is an amazing resource for people that love mechanisms or want to learn more about them.

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.