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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 128

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 128
inuity and resistance, and insulated TELEGRAPH I^STEUMENTS 117 parts sliould have a niiiiimum insulation resistance of amegohm. With new apparatus lacquer may have to beremoved to insure proper electrical contact. Two tests are made with differentially wound instru-ments : (1) for equal…

Telegraph

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

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