Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 197
l is connected directly to the mains and thepressure increased by another volt. The pressure can thus be adjustedby steps of two volts, the auxiliary contacts being only used to pass fromone step to the next. Another device is illustrated in Fig. 166. Here the switch-arm consistsof two parts…
Electrical engineering
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