Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 364
. Starting from zero currentthe resistance in the ciicuit is gradually diminished, thusincreasing the current until the maximum value desired isreached. The current is then reduced to zero, after whichits direction is reversed and it is carried on by similar stagesuntil the former maximum—only with… … Fig. 221. Starting from 0 with the iron demagnetised, it risesgradually at first, then more steeply, and after becomingvery steep the slope gradually falls until the line is almostparallel to the horizontal axis. At A the maximum forceand the maximum induction are reached. The force is now reduced…
Electricity · Magnetism
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