Abstract
THE invention of the oscillograph enabled electrical engineers to gain a further insight into many curious electrical phenomena. Some of these had been investigated mathematically previously, and in most cases the instrument gave a complete verification of the mathematical theory. The author begins by explaining how a periodic wave can be resolved into its harmonics. He then gives many useful mathematical theorems. He proves, for example, the conditions that the current and voltage waves must fulfil in order that the average power expended may equal the product of the effective volts by the effective amperes.
Theory of Alternating Current Wave-Forms
By Philip Kemp. (A Series of Monographs on Electrical Engineering, Vol. 1.) Pp. ix + 218. (London: Chapman and Hall, Ltd., 1934.) 15s. net.
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Engineering. Nature 136, 594 (1935). https://doi.org/10.1038/136594a0
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DOI: https://doi.org/10.1038/136594a0