Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 655
urrent in A, and thus produces in B inducedcurrents which are superimposed on the main current inthe arc derived from its source of supply. Thus the currentthrough the arc suffers periodic variation. This variationis accompanied by corresponding changes in the vapourcolumn between the carbons, and… … Fig. 108.—Simons Speaking Arc. Electrical Engineers in 1900, prefers the arrangementshown in Fig. 109. 649. In this arrangement M and E denote as before themicrophone and its battery; A and B are the primary andsecondary of the induction coil by which the microphoneaffects the current in the arc.…
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