Edison : his life and inventions . factors, the omission of any one ofwhich would probably have resulted eventually infailure. Continuing the digression one step farther in orderto explain the term multiple arc, it may be statedthat there are two principal systemsof distributing electric current, onetermed *series, and the other mul-tiple arc. The two areillustrated, diagrammat-ically, side by side, thearrows indicating flow ofcurrent. The series sys-tem, it will be seen, pre-sents one continuous pathfor the current. The cur-rent for the last lampmust pass through thefirst and all the interme-
Edison : his life and inventions . factors, the omission of any one ofwhich would probably have resulted eventually infailure. Continuing the digression one step farther in orderto explain the term multiple arc, it may be statedthat there are two principal systemsof distributing electric current, onetermed *series, and the other mul-tiple arc. The two areillustrated, diagrammat-ically, side by side, thearrows indicating flow ofcurrent. The series sys-tem, it will be seen, pre-sents one continuous pathfor the current. The cur-rent for the last lampmust pass through thefirst and all the interme-diate lamps. Hence, ifany one light goes out,the continuity of the pathis broken, current cannotW^wire^^^ flow, and all the lampsare extinguished unless aloop or by-path is provided. It is quiteobvious that such a system would becommercially impracticable where smallunits, similar to gas jets, were employed. On the otherhand, in the multiple-arc system, current may be con-sidered as flowing in two parallel conductors like the 253. SERIES
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