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The switch (the 1/4” by 2” tin-can strip) makes contact with. a bent nail. Screw it to the disk wherever convenient. Assembling the Cell-Lamp      Place the carbon electrode in the container temporarily to see if the top of the carbon will be high enough. If not, you’ll have to raise it by putting a block of wood on the bottom of the container. Now fill the container about half full of electrolyte.      Slip the zinc cylinder over the carbon electrode and lower the two into the container. The electrolyte should cover the zinc.      Through the small hole, feed the wire from the zinc electrode. Then screw the lid on the jar firmly. Tap a small nail into the disk next to the switch. After hooking the zinc elec trode wire around the base of the nail, bend the nail over so that the switch slides under it. Connect one of the socket wires to the screw on the switch; run the other socket wire to the carbon electrode terminal.      Now we’re in business. Flip the switch, and our Frankenstein cell-lamp springs to life instantly. It should last for hours. If you have any trouble, try a new bulb. Or check the zinc electrode wire; it may have come off. Other than that, agitate the jar a few times or jiggle the carbon rod a little.