Original poster: "resonance" <resonance@xxxxxxxxxxxx>It appears to be a 60 kV X-ray xmfr. Running intermittant at 20-25 kVA, yes, it could produce a 3 ft spark but only when struck at 4 inches and then "pulled" out. It will not "strike" an arc at 3 ft. That would require around 400-500 kV. External power reactor definitely required.
Dr. Resonance
Checkout this incredible transformer. The seller claims that the arc can leap 3 feet, but that seems impossible. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290053173975 Godfrey Loudner