By -
While the ball bearing might be among Leonardo Da Vinci's less celebrated inventions, it's arguably one of his most important. Though it was initially designed as part of his failed helicopter invention, it has stood the test of time – there are ball bearings of a similar design to Leonardo's in just about every moving machine.
The basic design in simple: in order to reduce rotating friction between two pieces, the bearing has an inner and an outer race.
READ MORE ON GIZMAG
