The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 340
andkey and operating the sounder by the local battery, andleaving by the other branch of the line. Messages cantherefore be received or sent in either direction, thecurrent being positive to all the stations on one side andnegative to all those on the other. The current is derived from both… … OOO^DO ^^ooooo
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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