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 115
y composed of thick wire, whereasfor high resistances wire of finer gauge is used. Besidesallowing for more accurate adjustment of actual lengthsrequired, this distinction in the employment of thick andthin wires provides for the probaljle strengths of currentstherein and the economy of size and… … Ill;. SO.- • Retaiilation coils. used in duplex working. It consists of eight coils havingrespectively 1(>, L>(r, ^Y, 40-, and 100, 200, 300, 400.These vahies provide a range from 10 to 1100 hy steps of 10. The coils of platinoidwire are douljle wound uponthe bobbins and so joined thatthe…
Telegraph
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