Principles of Electricity and Electromagnetism

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    PROF HARNWELL'S book is an interesting, and on the whole successful, combination of the classico-theoretical and modern-practical treatments of electromagnetism. We have, for example, in Chapter i the conventional elementary treatment of electrical images, while Chapter v treats at some length of current-voltage relations in non-ohmic circuit elements, including the interesting ceramic material, thyrite. A good deal of space is given to conduction in gases and to thermionic vacuum tubes, and in general any topic taken up is given a space very nicely proportioned to its present-day importance rather than to its historical interest. British students will find the book more suitable for reference than as a regular companion in a degree course-and its strongest appeal will be to the physicist with a marked bias towards the practical side of his subject, or even towards the more academic side of electro-technics.

    Principles of Electricity and Electromagnetism


    Gaylord P.


    By. (International Series in Physics.) Pp. xiii + 619. (New York and London: McGraw-Hill Book Co., Inc., 1938.) 30s.

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    Principles of Electricity and Electromagnetism. Nature 143, 960 (1939) doi:10.1038/143960c0

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