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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 183

An illustration from 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, leaf 183
(2) KEY DEPRESSED … (3) KEY RJSING -niiislratiiii cliaiLje ami dischar<;e of omniV>ns circuit. depression of an ont stations ke} does not alter thepotential at the head office, consequently no signal pro-duced. If an exceedingly high feed resistance be insertedthen almost a complete discharge occurs at the head…

Telegraph

Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.

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