the lower end of strip F. Figure 198 shows how the binding-post plate is made out of a doubled piece of tin, with a hole punched through it for a small binding-screw.
This completes the interrupter. Mount it beside the induction-coil upon the base block, and connect it with the battery and the induction-coil, as shown in Fig. 187. Connect the battery cells in series. Two cells will be enough.
Figs. 195-198.—Details of Interrupter.
How the Interrupter Works. When you turn the crank of the interrupter, each nail in spool E raises the end of strip F, in passing it, thus breaking the electrical contact between it and the head of nail G. If the strip has been bent properly, it will spring back into contact with the head of nail G, and each time the contact is made, the person holding the handles will receive a shock. The strength of the current can be regulated somewhat by the speed with which the interrupter crank is turned. The shocks are stronger and more distinct when the crank is turned slowly.
