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 118
trated in Fig.85. The contact studs are larger and are arranged in twocircles on the ebonite top. Reliable connection is obtainedbv the radial arn:is consisting of three phosphor bronze TELEGRAPH INSTRUMENTS 107 strips bent ro that eadi separately touches tlie contactstuds. The coils are of… … Kic. S5.—Rheostat 1). 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…
Telegraph
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