Below are a collection of animated GIF files that do a brilliant job at visually explaining how complex mechanical procedures such as how a sewing machine works.  These would be great for science and engineering students or simply those who have an inquisitive mind.  Enjoy.

RADIAL AIRCRAFT ENGINE:

OVAL REGULATION:

SEWING MACHINE:

MALTA CROSS MOVEMENT - SECOND HAND MOVEMENT USED TO CONTROL THE CLOCK:

AUTO CHANGE FILE MECHANISM:

AUTO CONSTANT VELOCITY UNIVERSAL JOINT:

GUN AMMUNITION LOADING SYSTEM:

ROTARY ENGINE - AN INTERNAL COMBUSTION ENGINE, THE HEAT RATHER THAN THE PISTON MOVEMENT INTO ROTARY MOVEMENT:

INLINE ENGINE - IT'S CYLINDERS LINED UP SIDE BY SIDE: