He also believed that those experiments confirmed the assumption of Wien, that there is no " real " mechanical mass, but only the " apparent " electromagnetic mass, or in other words, the mass of all bodies is of electromagnetic origin.
2.
Kaufmann noticed that the observed increase cannot be explained by this formula, so he separated the measured " total mass " into a " mechanical ( true ) mass " and an " electromagnetic ( apparent ) mass ", the mechanical mass being considerably greater than the electromagnetic one.
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