Surface resistance of glass

If a direct voltage is applied between two electrodes on the same surface of a glass specimen the resultant leakage current diminishes with time. Previous literature concerning this phenomenon is reviewed and some anomalies are noted. Research work aimed at determining the nature and properties of the change is described. It is concluded that the appreciable decrease in leakage current with time is due mainly to polarization at the interface between the electrode and the surface film, and not to a change in surface resistivity of the specimen.