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

7, gun ammunition loading system

8, rotary engine - an internal combustion engine, the heat rather than the piston movement into rotary movement 
9, Inline engine - it's cylinders lined up side by side

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