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 125
of the reatiings of a second condenser,Avhich replaces the first one. The throw of the needle isproportional to their respective capacities. To comply with the requirements of the Post Officespecification the capacity of each section of a condenser ismeasured throiigh a carefi;lly calibrated… … > EARTH Dischiiige key and cniidensi r capacity test. and the mininmm insulation allowed is KKIO megohms permicrofarad, so that a 5 m.f. condenser should have at least1 o_oo^ or 200 megohms insulation resistance. The reading-is observed one minute after the battery is first applied tothe…
Telegraph
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