So B. and I made a telegraph - a working telegraph with batteries and everything. Above is the Key. When all the wires are connected the Key is what completes the circuit to make the electro-magnet pull the receiver down to "click" on the nail.
The batteries. Wires are connected so that there is a wire between the key and the batteries, from the batteries to the receiver and from the receiver to the key. The red wire wrapped around the nail makes the electromagnet. The "click" part is slightly above the head of the other nail so that when the magnet pulls it down it makes a sound.
Another amateur video below. Someday I'll learn how to do one that really shows what I want it to. It should be showing the metal clicking on the top of the nail and how the wires are connected to make a circuit.
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