In the year 1890 he severed his connection with the Westinghouse
Company, since which time he has devoted himself entirely to the study
of alternating currents of high frequencies and very high potentials,
with which study he is at present engaged. No comment is necessary on
his interesting achievements in this field; the famous London lecture
published in this volume is a proof in itself. His first lecture on
his researches in this new branch of electricity, which he may be said
to have created, was delivered before the American Institute of
Electrical Engineers on May 20, 1891, and remains one of the most
interesting papers read before that society. It will be found
reprinted in full in _The Electrical World_, July 11, 1891. Its
publication excited such interest abroad that he received numerous
requests from English and French electrical engineers and scientists
to repeat it in those countries, the result of which has been the
interesting lecture published in this volume.

The present lecture presupposes a knowledge of the former, but it may
be read and understood by any one even though he has not read the
earlier one. It forms a sort of continuation of the latter, and
includes chiefly the results of his researches since that time.





EXPERIMENTS WITH ALTERNATE CURRENTS OF HIGH POTENTIAL AND HIGH FREQUENCY


I cannot find words to express how deeply I feel the honor of
addressing some of the foremost thinkers of the present time, and so