Abstract
THIS book contains technical data which will be useful in the design of electric machines and apparatus. The requisite mathematical reasoning has been simplified so far as possible. We have noticed, however, several misprints in the equations (p. 23). In discussing the measurement of potentials by instruments based on the hot-wire principle, it is stated that owing to their low inductance the current is in phase with the potential difference. In making this inference it is assumed that the resistance of the hot-wire instrument is practically constant over the half-period of the applied potential difference. It would be well to mention this. The chapter on protective gear is useful, but the notes on lightning arresters are too brief to be of much value.
Practical Control of Electrical Energy.
By A. G. Collis. (Oxford Technical Publications.) Pp. xii+160. (London: Henry Frowde and Hodder and Stoughton, 1923.) 10s. 6d. net.
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Practical Control of Electrical Energy. Nature 113, 9 (1924). https://doi.org/10.1038/113009d0
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DOI: https://doi.org/10.1038/113009d0