The induction coil provides very high voltages (several tens of thousands of volts) from a DC source. The principle is based on a step-up transformer comprised of a primary winding, a few tens of turns, and a secondary winding, hundreds of thousands of turns. To produce permanent sparks, it is necessary to cut the current flowing in the primary winding with a shaker (electromagnetic bell).
The induction coil stands 6″ tall, 11.5″ wide and 7″ long. Each spark rod measures 5.25″ long and 2.25″ wide