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 64
61 armature, the active length of each of the bars being •H feet. The copper rings are connected to one hundred and thirty-eight insulated copper sectors, which form a cylindrical commutator of the ordinary form. The contact brushes are arranged in the usual manner. The engine which drives the… … When the machine runs at the rate of three hundred and fifty revolutions a minute an electro-motive force of about 100 volts is obtained. In the smaller machine the magnets are vertical; in the larger machine the horizontal arrangement is adopted.
International Electrical Congress, Paris, 1881
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