How to Build a "Foxhole Radio"
Next put the razor blade in place in front of the coil. Be very careful when you handle the blade; it is sharp. Lay the blade flat on the board, and gently fix it in place with two metal thumbtacks. Do not push the tacks all the way into the board; just start them like this:
Next is the safety pin. First, sharpen the pencil so that you have a long piece of lead showing. Break off the lead, and put it next to the point of the safety pin. Cut a piece of wire off the spool and pull off the cotton covering so that the wire is bare. Now wire the piece of lead to the point of the pin.
With your pliers bend the head of the pin back so that it will lie flat on the board.
Now the safety pin looks like this:
Place the pin to the right of the razor blade. Put one of the nails through the head of the pin, and with the hammer drive the nail into the board until it almost touches the pin.
All the parts are in place. Now we hook them together with wires. We do this by using the pocket knife to remove the cotton covering from the ends of the wire so that they are clean and the copper of the wire shines brightly. This is most important because the set will not work without clean, tight connections.
Let's take the left half of the set first:
Take the wire from the coil and wrap the bare end around Nail A in the corner. This is Connection No. 1.
Take another wire and put a bare end underneath the thumbtack that holds the razor blade. Push the tack down as hard as you can so that the bare wire is against the blade. Then take the other end of this wire and wrap it around Nail A. This is Connection No. 2.