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Abstract
WHEN a drop of dilute potassium chloride solution is placed on a horizontal sheet of freshly abraded iron, corrosion occurs at the centre of the drop, but the periphery remains unattacked1. This phenomenon is commonly ascribed to electric currents flowing between the (well-aerated) peripheral zone as cathode and the (less well-aerated) central zone as anode. In several analogous cases, such as partly immersed plates of metal, the electric currents have been measured and found to be sufficiently strong to account for the whole of the corrosion observed2. The study of the currents flowing in drops has been somewhat less direct, and the following experiment may possess general interest.
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