The primaries are wound with thicker copper enamelled covered wire on letherite pipe in two layers. The secondary coils are divided into two parts and are given heavy insulation, each layer is wound in the cover of butter paper and after completing the winding the entire is dipped into hot wax, so that each layer is sealed against moisture effect.
The coils are housed in a teakwood base, voltage tested condensers are fitted inside the wooden polished base. Handles to get the spark are on it the make and break points are of silver. One point is adjustable to get any cycle. On off reversing switch commutator, working on 6-12 V d.c. Spark in Air
