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 119
thicknesses, tlic coils connected to the studs marked 4(K>,800, and 1200, are of wire 10 mils in diameter, wliilo llicremaining 400 coils are wound with wire of iS milsdiameter. One bobbin carries the 4000 coil which iswound with wire of 5 mils thickness. The 400 and -10bobbins after being wound… … Xi^^ F 4000 400 ^^413600 400 SCO^ EACH COIL
Telegraph
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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