Abstract Through experimental study of graphite, coppor and ore specimens fromseveral ore districts in a water tank, the authors systematically observed theirtime spectra and current spectra. The electrode superiority of their time spectraand current spectra divides them ioto two basic types. On the basis of electroche-mical theories, the mechanism responsible for these two basic types are accou-nted for, and it is held that this might hare something to do with solubility ofthe specimens. Under certain conditions, it is possible to distinguish solubility and insolubility of the polarized bodies according to electrode superforities ofthe spectra.
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