The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 188
frelay made by the Western Electric Co. much used in common .battery work. A soft-iron core extension is bent underthe coil, and has a notch in the opposite end, in which rests RELAY AND LAMP SIGNALLING 163 one end of the armature, the lower end of which is bevelled to aknife edge. The armature is… … Fig. 185 another contact fixed on the fibre end of the coil, formingpart of the local circuit. This latter contact is connected byinsulated wire to a soldering tab at the opposite end, and ascrew in the centre connects to the armature and other metalwork, which forms the remaining part of the local…
Telephone
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