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Clip one of the alligator clamps from the galvanometer to the top of the zinc electrode. Clip the other clamp to the graphite on the air electrode. The clamp must contact the graphite. You may have to cut away some of the gauze to ensure such contact.
Arrange the galvanometer as indicated in Experiments 2 and 3. Then stand the fuel cell in the saucer. As the salt water soaks into the gauze, electrochemical action should start. It does! The deflecting galvanometer needle proves that electricity is being generated.
Depending on how you made the fuel cells, needle deflection may or may not be large. But any movement at all proves the point. Interchanging the galvanometer connections to the fuel cell may make the deflection more noticeable.