Based on the understanding that rolling friction is significantly smaller than sliding friction; The user turns the handle and observes how the disks rotate smoothly over the balls and rollers. In principle, da Vinci's ball bearings are identical to those we use today in an endless number of mechanical applications. It is the precursor of today's thrust bearings, commonly used in automotive, marine, and aerospace applications, such as the clutch release of a car and the the main and tail rotor blade grips of radio controlled helicopters.
Technological Mechanism: Ball bearing
Size in millimeters: height: 200