International Library of Technology · Scranton, International Textbook Co. · leaf 141
om the conduits previously described in that the con-ductors are placed in iron tubes that are buried in theground. The conductors are,therefore, not removable. Thisarrangement has been used ex-tensively by illuminating andpower companies in the largercities. The conductors them-selves are usually… … in Fig. 30. Each rod is wound with an open spiral of ropethat serves to keep the rods separated in case the insulating 26 ELECTRIC TRANSMISSION. §15 material in the tubes should become soft. After the rodshave been provided with the rope spiral, they are boundtogether by means of a wrapping of rope…
Electrical engineering
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