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The experiment herewith described confirms the effect obtained by us earlier [1]: the effective electron's mass is changed when it is placed anywhere inside a charged spherical shell at a constant and uniform Coulomb potential, V.

A new independent experiment confirms the conclusion of a previous one, namely that the inertial mass of an electron is changed when the electron is placed anywhere inside a charged spherical shell at a static potential V . In the present case, this effect, stemming from Weber's electromagnetic theory, is observed through the expected linear variation of the frequency of a Barkhausen-Kurz generator with the magnitude V of the voltage.

An experiment herewith described proves that the electron's mass is changed when it is placed anywhere inside a charged spherical shell at Coulomb potential U.