Build a vacuum cannon

This is a cool build.  Basically they author uses PVC pipe to build a vacuum chamber to use as a cannon.  This would be a cool build with kids.

http://www.instructables.com/id/Large-Bore-Vacuum-Cannon/?ALLSTEPS

Oh the author has another nice write-up on building a vacuum pump from PVC.

http://www.instructables.com/id/Make-a-High-Volume-Manual-Vacuum-Pump/

 

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