Garry Garbutt demonstrates his largest Tesla coil, which he calls "Big Bertha," named after the infamous First World War artillery piece. Stored unused for many years, it required some effort to get it tuned back up and operating properly. The lethal voltages, both in the primary and secondary, require a lot of caution when working around this machine. When running, the words "angry and loud" describe the noise this coil generates. We started work in the twilight and when it finally ran, it was completely dark, so please forgive the less than perfect video and audio quality.