From DT Online

Thumb CornelGears.jpg

KMODDL is a collection of mechanical models and related resources for teaching the principles of kinematics--the geometry of pure motion.

The core of KMODDL is the ‘Reuleaux Collection of Mechanisms and Machines’, an important collection of 19th-century machine elements held by ‘Cornell's Sibley School of Mechanical and Aerospace Engineering’.

Browse the Multi-Media section to see working mechanisms.