  It is common in the literature on classical electrodynamics and relativity
theory that the transformation rules for the basic electrodynamic quantities
are derived from the pre-assumption that the equations of electrodynamics are
covariant against these---unknown---transformation rules. There are several
problems to be raised concerning these derivations. This is, however, not our
main concern in this paper. Even if these derivations are regarded as
unquestionable, they leave open the following fundamental question: Are the
so-obtained transformation rules indeed identical with the true transformation
laws of the empirically ascertained electrodynamic quantities? This is of
course an empirical question. In this paper, we will answer this question in a
purely theoretical framework by applying what J. S. Bell calls "Lorentzian
pedagogy"---according to which the laws of physics in any one reference frame
account for all physical phenomena, including what a moving observer must see
when performs measurement operations with moving measuring devices. We will
show that the real transformation laws are indeed identical with the ones
obtained by presuming the covariance of the equations of electrodynamics, and
that the covariance is indeed satisfied. Beforehand, however, we need to
clarify the operational definitions of the fundamental electrodynamic
quantities. As we will see, these semantic issues are not as trivial as one
might think.
