The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 188
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… … Elevation Fig. 186 spiral spring a ensures a good contact with the armature.The coil-wire terminals are also brought out to insulatedsoldering tabs. A cylindrical metal cover, which is notshown, is passed over, and screwed on, rendering the wholedust-proof. This is called a single make relay, and…
Telephone
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