The Kinematic Models for Design Digital Library (KMODDL) currently
contains six distinct collections of model mechanisms:

Reuleaux Collection of Kinematic Mechanisms, Cornell University

The 220 models in Cornell University’s Reuleaux Collection were built in the late 19th century to demonstrate the elements of machine motion, as theorized by the German engineer Franz Reuleaux. The University acquired the models in 1882 for use in teaching and research. This is KMODDL’s core collection and at present is the most extensively documented and enhanced with multimedia resources.

Clark Collection of Mechanical Movements, Museum of Science, Boston

The Clark Collection at Boston’s Museum of Science is a set of working models of mechanical movements and combinations of drive mechanisms built by American engineer William M. Clark in the early 20th century. Cornell University Library and the Museum of Science are collaborating in 2005-2006 to integrate the entire Clark Collection into KMODDL; for now a sampling is available here.

Redtenbacher Collection of Kinematic Mechanisms, University of Karlsruhe, Germany

This collection contains approximately 100 19th-century models, most of them manufactured in the workshop of the Polytechnische Schule in Karlsruhe, Germany under the guidance of Ferdinand Redtenbacher when he was Professor and Director of this institution from 1841 to 1863. The Redtenbacher Collection is housed in the Institut für Kolbenmaschinen (Combustion Engines) at the Universität Karlsruhe.

Illinois Gear Collection, Cornell University

This set of 15 models built by the Illinois Gear & Machine Company of Chicago was acquired by Cornell University around 1950. Documentation of the collection is in progress; models will be made available as the descriptions are completed.

Reuleaux Collection, Bauman Moscow State Technical University

Bauman Moscow State Technical University (BMSTU) has a collection of about 60 models from the Voigt-Reuleaux models catalog. Gustav Voigt of Berlin put out two catalogs of models of Franz Reuleaux. The 230 models featured in Cornell's Reuleaux Collection in KMODDL are from Voigt's first catalog. Of special interest are the models in the second Voigt catalog since there are 20 models at BMSTU from this second catalog that are not available anywhere else in the world.

Schröder Collection, Foundation for Science and Technology, Florence, Italy

The Schröder kinematic models at the Foundation for Science and Technology (FST) comprise one of the largest collection of kinematic models of the Jacob Peter Schröder company of Darmstadt, Germany founded in 1837. His catalogs of 1870-1900 listed models copied after the kinematics and machine engineering books of Ferdinand Redtenbacher of Karlsruhe University and his student, Franz Reuleaux of the Technical Uniersity of Berlin.