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it is still probable from the outset, that at least effects of second order are at least partially removed. At this time, Bucherer is still concerned with the discussion of this question. Anyway, it appeared to be appropriate to include Bucherer's electron in these considerations as well.
I anticipate the general result (described below) of the measurements:
The measurement results are not compatible with the fundamental assumption of Lorentz-Einstein. The equation of Abraham and that of Bucherer represent the measurement results equally well. A decision between the two latter theories by measuring the transverse mass of -rays appears to be impossible for the time being.
