Abstract
THE author of this volume is the professor of electrical engineering in the Stevens Institute of Technology. It is primarily intended for the students in his classes, but it will be of interest to many teachers of physics and engineering in Great Britain. The author writes clearly, his object being to explain the essential elements of electrical science and its applications. It will prove useful as a class-book, and we also think that it will be useful to the private student who has a sound knowledge of elementary physics. The rational system of units is employed, the permittivity of a vacuum being taken as 1/(47φ). Some formulae are simplified, but others are made slightly more complex. The “true” units and the “international” electric units are both given. Seeing that now testing laboratories can measure resistances, and so on, in true units with an accuracy far exceeding that required in industry, we think that the time has come when the “international” units can be regarded as obsolete. No instrument reads absolutely correctly, and the “tolerance” permissible, with a given type of instrument, is many times greater than the possible error in calibrating the standard in true units. Mathematical proofs are always given when they can be understood by the average student, but advanced mathematical proofs are excluded. Many collections of problems are given throughout the book, and we were glad to see that the answers are given to them.
Electrical Engineering.
By Prof. L. A. Hazeltine. (Engineering Science Series.) Pp. xvi + 625. (New York: The Macmillan Co., 1924.) 30s. net.
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Electrical Engineering . Nature 116, 496 (1925). https://doi.org/10.1038/116496b0
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DOI: https://doi.org/10.1038/116496b0