LIQUID FLOW AT SMALL CONSTANT RATES

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Abstract
A supply of liquid at an extremely small rate is frequently required for laboratory scale experiments. An unusually convenient method of supply became possible on its becoming known that Faraday's law held good even for electric currents of the order of microamperes, if electrodes were properly placed in a suitable electrolyte. The apparatus required is simple. Gas is liberated from the electrolyte in a small cell at a rate proportional to the current passing through it. The cell is connected to a vessel containing the liquid to be metered and when temperature and pressure become steady, liquid is discharged through an outlet from the vessel at a rate directly proportional to the electric current through the cell.

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