Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 79
uctor of douljled size. This halving of effective turns only applies to themomentary effects of self-inductance. The magnetic fieldgenerated by steady currents is proportional to the actualnumber of turns, which remains the same whether joinedin series or jDarallel. The following interesting… … Fig. 41.—Self-iiiductaiice exijerimeiit with relay and two .souikIlI.s. move tongue to spacing when the signal ceases, and relaythen is ready to repeat the next signal to sounder 2 whenkey is again depressed. In the local circuits the effect of the considerableinductance of the sounder was sparking…
Telegraph
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