A sincere but unfortunately not quite successful attempt to combine history and scientific data. The historian will be disappointed by the mass of technical material and the scientist dismayed at the attempt at chronological development, which, as the author admits, is difficult because of the simultaneous but independent progress of the electrical communications pioneers. The author is to be congratulated on the mass of information compiled (most of which can be found in the eleventh edition of the Encyclopedia Britannica) which was undoubtedly an exhaustive task. His text does serve to acquaint the layman with the men whose names have come down to us as terms used in engineering -- Ohm, Henry, Yolt(a), et. al.