Tesla List wrote: > Just wondering if anyone has had any success with non tubular > secondaries, say octagon or higher? K. D. Skeldon, A.I. Grant, and S. A. Scott, "A high potential Telsa coil impulse generator for lecture demonstrations and science exhibitions," American Journal of Physics, Vol. 65 (8), pp. 744-754, August 1997. This paper describes an hexagonal secondary. Antonio Carlos M. de Queiroz