Named after Heinrich Ruhmkorff, the German scientist who generated higher voltages in induction coils by greatly increasing the length of the secondary, in some coils using 5 or 6 miles (10km) of wire and produced sparks more than 1 foot in length.
Therefore, the Ruhmkorff coil became the commercialized form of the induction coil and was used for the operation of Geissler and Crookes tubes etc.
Our apparatus consists of a central cylindrical core of soft iron on which are wound two insulated coils: an inner or primary coil, having relatively few turns of copper wire, and a surrounding secondary coil, having a large number of turns of thinner copper wire.
It is mounted on a rigid wooden base.
The interrupter is incorporated in the apparatus.
Our coils are made from the best quality enameled copper wire and paraffin insulation is provided throughout.
A pair of pointer electrodes is supplied with the instrument. Pointer electrodes have an insulating handle for adjustment of the spark gap.
Our model simulates the traditional Ruhmkorff model of induction coil. It takes you down the history lane and forms for an apparatus that would enthrall your students.