Instructables user Beachley is a mechanical engineering student in college, and gave us permission to publish his instructable for all you curious tinkerers here on TreeHugger.
From Beachley: "With Halloween right around the corner, there's no better time to build your very own Tesla Coil! Over the past Summer, I built two Tesla Coils. The first one didn't work, so I started building a second one. This instructable will outline the steps I took."