Max Abraham ( 1902 1904 ), who was a supporter of the electromagnetic world view, quickly offered an explanation for Kaufmann's experiments by deriving expressions for the electromagnetic mass.
12.
As explained above, he introduced the so-called " transverse electromagnetic mass " besides the " longitudinal electromagnetic mass ", and argued that the entire electron mass is of electromagnetic origin.
13.
As explained above, he introduced the so-called " transverse electromagnetic mass " besides the " longitudinal electromagnetic mass ", and argued that the entire electron mass is of electromagnetic origin.
14.
This was connected with the theoretical prediction of the electromagnetic mass by J . J . Thomson in 1881, who showed that the electromagnetic energy contributes to the mass of a moving charged body.
15.
Using Searle's formula ( 1897 ) for the electromagnetic energy increase of charged bodies with velocity, he calculated the increase of the electron's electromagnetic mass as a function of velocity:
16.
Fermi addressed this the next year in a paper " Concerning a contradiction between electrodynamic and the relativistic theory of electromagnetic mass " in which he showed that the apparent contradiction was a consequence of relativity.
17.
Based on the preceding work on electromagnetic mass, Friedrich Hasen�hrl suggested that part of the mass of a body ( which he called apparent mass ) can be thought of as radiation bouncing around a cavity.
18.
The first paper seemed to point out a contradiction between the electrodynamic theory and the relativistic one concerning the calculation of the electromagnetic masses, as the former predicted a value of 4 / 3 U / c 2.
19.
At this time, the electromagnetic mass was separated into " transverse " and " longitudinal " mass, and was sometimes denoted as " apparent mass ", while the invariant Newtonian mass was denoted as " real mass ".
20.
The concept of ( transverse ) electromagnetic mass m _ T, which was based on specific models of the electron, was later transmuted into the purely kinematical concept of relativistic mass which concerns all forms of energy, not only electromagnetic energy.
