Six cells—open circuit battery.
One three-lever switch.
One 8 or 10 inch spark coil.
Three pounds No. 16 patent finish office wire.
Two ounces No. 24 gas-fixture wire.
One pound tinned 3/8" staples.
Few square inches tinfoil.
Small roll insulating tape.
Tools: 4-inch screwdriver, pocket knife, 4-1/2-inch side-cutting pliers, hammer, piece of sandpaper.
The simple section switch is shown enlarged in Fig. 22. The wires 1, 2, and 3 are from their respective circuits and terminate at the switch arms A A A. The wire from the battery B and coil C runs to each switch-stud S S S. If trouble shows on the line, each circuit can be thrown off by moving its switch arm until the fault is located. If it is not found at once, and the battery is weak, (test each cell with an ordinary electric bell), open all the circuits until the battery is recuperated, and disconnect the battery wire from the switch. Then attach the battery wire to the bell and touch each switch lever with a wire from the other binding post of the bell. If there is a short circuit on any section, the bell will ring or tremble when the arm is touched.