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Each of the four systems ${\overline {\mathfrak {S}}}$, $A$, $B$ and $K$ now forces a special state to the aether, and thus acts on any of the others. To shortly indicate these actions, we want to put $\left({\overline {\mathfrak {S}}},K\right)$ for those actions, which for example were exerted by ${\overline {\mathfrak {S}}}$ on $K$, where we have to notice that perhaps $\left({\overline {\mathfrak {S}}},K\right)$ and $\left(K,{\overline {\mathfrak {S}}}\right)$ are not equal and opposite, and that also actions such as $\left({\overline {\mathfrak {S}}},{\overline {\mathfrak {S}}}\right)$ may exist, namely forces which act on one of the ion systems due to condition changes in the aether, which were caused by itself.

In easily understandable symbols we can now write for the total action on K

$(K,K)+(B,K)+({\mathfrak {\overline {S}}},K)+(A,K){,}$

which, however, due to § 25

$({\overline {\mathfrak {S}}},K)+(A,K)=0$

is reduced to the first two terms and thus becomes independent of the current.

On the other hand, the forces which act on the conductor, can be represented by a expression consisting of 12 members,