I had the idea for this when I was 14, about 40+ years ago, and may have drawings for it still.
http://www.boingboing.net/2011/04/19/railgun-fires-hugo-a.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+boingboing%2FiBag+%28Boing+Boing%29&utm_content=Google+Reader
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