Induction Coil (Ruhmkorff Coil ) for Physics Lab -
The primaries are wound with thicker copper enamelled covered wire on letherite pipe in two layers.
The secondary coils are divided into two parts & are given heavy insulation.
Each layer is wound in a cover of butter paper & are completing the winding, the entire is dipped into hot wax to seal each layer 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 fitted on it & make or break points are of silver. One point is adjustable to get any cycle.
On/off reversing switch commutator working on 6 to 12 V DC. Size - 10 mm, 25 mm, 50 mm, 75 mm, 100 mm.