American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 639
ouse-top iixtiLres in chapter on Construction. The average number of conductors in a tele-graph underground cable, inlarge cities, is about 50, althoughmuch smaller cables are alsoused. In Fig. 391 a specimenof an 18 conductor cable isshown, c is the ^.entral wire.M and m are ^marking wiresfor the… … FIG. 392. covering. The size of the wire used is,eter of its insulated covering is ^% inch,conductor. The types of cables more generallyused by the telegrapli com])anies ofthis country, for underground service,are those known as the Kerite, * Okonite, * Safety Standard and Paterson. The insulation…
Telegraph
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