  English translation of P. Drude, Annalen der Physik 13, 512 (1904), an
article by Paul Drude about Tesla transformers and wireless telegraphy.
Includes a discussion of the derivation of an equivalent circuit and the
prediction of nonreciprocal mutual inductance for Tesla transformers in the
article, which is supplementary material for B. McGuyer, PLoS ONE 9, e115397
(2014).
