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Finally, tape the cell and wires to your block of wood sothat you can handle it conveniently.
Now set the cell aside. It’s time to build a simple but very sensitive device – a galvanometer – to show that the cell can actually produce electricity. Making one is easy.
Cut and fold two pieces of cardboard and glue them back- to-back as shown in the drawing. Lay the compass inside this little “stand” so that the N and S markings are against the folded-up sides. Then wind about 100 turns of magnet wire around the compass and stand. Run the wires over the N-S markings, keeping them close to the center.
When finished, twist the ends of the coil to keep them from unwinding. Trim these ends to about 12" in length. Then scrape ½" of the enamel from the wiretips,and install the alligator clamps.