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Electrolysis setup. Test tubes. Water tank. Battery eliminator. Cables and clips. Foil electrodes. Immerse test tube under water, and tilt so that it fills with water: remove air bubbles. Insert electrode, and invert. Keep the mouth below water level, and the tube stays filled with water.
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Test tubes Water tank Battery eliminator Cables and clips Foil electrodes
Immerse test tube under water, and tilt so that it fills with water: remove air bubbles. Insert electrode, and invert. Keep the mouth below water level, and the tube stays filled with water. tape
When all is ready, power on. It may take a few minutes before gas bubbles are visible.