Abstract
WE can commend the fifth edition of this book highly. It is easy to understand, has been thoroughly brought up to date and will appeal to students, teachers and engineers. The answers are given to the problems set and many of them are completely worked out. Electrical engineers can refresh their memory about the fundamental facts of atomic dis integration, thermionic valves and photo-electric cells. They will even find something instructive said about tariffs and the British Grid. We think, however, that the authors' resume about the laws governing the sizes of fuses and the temperature rise in cylin drical conductors could have been improved. They have not laid sufficient stress on the important part played by thermal convection currents in this con nexion. A better rule than the one given is that, within certain limits, the fusing current varies as the 1.25th power of the radius of the wire. A proof is given by Russell (Proc. Phys. Soc, 22, 450).
Technical Electricity
H. T.
Davidge
Robert W.
Hutchinson
By. Fifth edition. Pp. x + 520. (London: University Tutorial Press, Ltd., 1936.) 12s. 6d.
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Technical Electricity. Nature 139, 947 (1937). https://doi.org/10.1038/139947d0
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DOI: https://doi.org/10.1038/139947d0