Electrical appliances of the present day; being a report on the Paris Electrical Exhibition of 1881 (1884)
Heap, D. P. (David Porter), b. 1843 · New York, D. Van Nostrand · leaf 209
B and B' being connected to the opposite poles. Ordinarily one machine supplies each light. Thus the current arrives by A, and, without traversing the commutator, goes bv the cable to the regulator (or lamp); thence it returns by the second wire of the same cable to N, follows the vertical… … Fig. 185. P, retaining always the contact at X. In this case the current arrive-, a- before, at A, goes to the regulator, returns again, but pa»es thi> time from X" to P', and thence to the machine by B\ In foul weather, or whenever it i> neees-ary to increase the himinmi- intensity, both machines…
International Electrical Congress, Paris, 1881
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