The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 359
A and B. The Stearns, or neutral^ relays, as they arecalled in distinction from the polar, are shown at iV^ andiV\ and their connected transmitters at T and T^\ the THE ELECTRIC TELEGRAPH. 343 polar relays, at R and F}^ and their connected pole-changers at P and P^. The artificial lines are…
Electricity · Magnetism
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