Gauss gun/Coilgun - A coilgun (not to be confused with a railgun) is a type of magnetic accelerator gun (MAG) or magnetic accelerator cannon (MAC). It uses one or more electromagnetic coils to accelerate a magnetic projectile to high velocity. (Wikipedia)
Here's a fun little site - Science Toys You Can Make With Your Kids
And an article for making a nifty device - The Gauss Rifle: A Magnetic Linear Accelerator
Knowledge is power - Bacon
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