Hoffman Voltameter Glass Stopcock. Comprises three parallel tubes, joined at the bottom with horizontal tube. The central tube has funnel for filling with water, and the side tubes have open ends at the bottom to allow bungs that hold electrodes to be fitted, and jets with stopcocks at the top for collecting gas in test tubes.The side tubes are graduated 0-50 x0.2 mL so that the volume of gas in each can be measured.Clamps and support base (sold separately) are recommended so the unit can be mounted on retort rod.
