Although replaced in recent years by roller bearings, friction bearings (also called solid bearings or plain bearings) were a railroad standard for many years. Friction bearings were blocks of metal, ...

The mechanical properties of natural joints are considered unrivalled. Cartilage is coated with a special polymer layer allowing joints to move virtually friction-free, even under high pressure. Using ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. The Aetna Ball & Roller Bearing ...