The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 359
scott, in im-proving, combining, and applying apparatus previouslyinvented by others. Construction and Operation of the Quadruplex.—The Edi-son quadruplex system, as now operated by the WesternUnion Telegraph Company, is a combination of theStearns duplex and polar duplex, in such a manner that…
Electricity · Magnetism
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