Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 128
Fiii. 00.—SfcinJard relay as pduiiiCleil fni- ditlerentialily losls. hy the same cnrrent jiassing in opposite directions in thefirst test, and by equal currents in the second, if provessatisfactorv diiTcrentialitv. ExEncTSFi in. 1. (a) Wliat are induced and unindnced needles? (h)Why are tlie…
Telegraph
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