  The force exerted by an electromagnetic body on another body in relative
motion, and its minimal expression, the force on moving charges or
\emph{Lorentz' force} constitute the link between electromagnetism and
mechanics. Expressions for the force were produced first by Maxwell and later
by H. A. Lorentz, but their expressions disagree. The construction process was
the result, in both cases, of analogies rooted in the idea of the ether. Yet,
the expression of the force has remained despite its production context. We
present a path to the electromagnetic force that starts from Ludwig Lorenz'
relational electromagnetism. The present mathematical abduction does not rest
on analogies. Following this path we show that relational electromagnetism, as
pursued by the G\"ottingen school, is consistent with Maxwell's transformation
laws and compatible with the idea that the "speed of light" takes the same
value in all (inertial) frames of reference, while it cannot be conceived on
the basis of analogies with material motion.
