Here are 9 great mechanical principles and inventions, which show the greatness of the human mind.

Simple animation to explain complex principles:

1: Aircraft Radial Engine
2: Oval Regulation
3: Sewing Machines

4: Malta Cross movement -Second hand movement used to control the clock

5: Auto Change file mechanism
6: Auto Constant Velocity Universal Joint
: Gun Ammunition loading system
8: Rotary Engine - an internal combustion engine, the heat rather than the piston movement into rotary movement Also Known as the Wankel Engine after it's inventor.

9: Boxter Engine - it's cylinders lined up side by side