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Simple animations to explain complex procedures

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: