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Now unwrap the rag and empty the contents into a container other than the one intended for the battery. Add a cup of warm water, stir with a stick, and set the container aside for the time being.      THE LID AND LAMP BASE. What we have to do here is form the jar lid and wood disk into one piece. So first carefully remove the waxed liner from the lid. Also remove from the center of the lid a circle of metal about 1-1/2” in diameter. This doesn’t have to be done accurately or even neatly. But curled edges should be flattened with a hammer.      Next, make a 1” diameter hole in the center of the wood disk. The hole should be big enough so that the carbon rod fits easily into it. Now with the wood disk placed on something you can hammer on, center the lid on the disk and fasten with a few small nails. Pound the nails right through the lid into the disk. The nails may go through the disk, so make sure you are not working on a good surface.      Either file the protruding nail points flat, or simply bend them over. Replace the waxed liner, and cut out the 1” hole with a knife (careful now). Finally, about halfway between the inner and outer edges of the disk, drill a 1/8” hole so that the wire from the zinc electrode can be brought to the top.      You can skip the next step if you want. But ammonium chloride, as it crystallizes, may creep up the inside wall of the container or up the carbon rod and eventually work its way to the disk. To control this creeping, let the wax from a burning candle drip around the inside lip of the container and around the carbon rod (except for the part that fits into the hole in the disk).      LIGHT SOURCE AND SWITCH. For the socket support, make a 90o bend at one end of the 1” by 2” tin-can strip; and at the other end form a hole big enough to hold the socket snugly. Nail this support to the wood as shown.      Before inserting the socket, take a sheet of aluminum foil and fold it in half about three times to make it stiff. Form it into a miniature reflector, jab a hole in the center, and slip it onto the socket. Then insert the socket into the support.