THE AUTHOR'S PREFACE The plan of the present work arose out of a lecture on the Magnetic Circuit and its Measurement, which I delivered on the occasion of the International Congress of Electricians at Frankfort in September 1891. From several sides the desire was expressed for a systematic and critical account, from, the physical point of view, of the more important developments in this direction. Hitherto such an account had been wanting, and this deficiency I have endeavoured to supply, however imperfectly. The important action which the rapid rise of electro-technology in the last decade has exerted on those branches of physics which form its basis, has been abundantly insisted on, and almost universally recognised. Electro-technology seems at present to have entered on a phase of quieter development; and from the scientific point of view the time appears suitable to survey the position, critically to investigate results of very unequal value, often hastily brought to light amids
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