International Library of Technology · Scranton, International Textbook Co. · leaf 216
k. In the center-pole method of construction, thebrackets extend on both sides, and when the pole is ofwood, a hole may be bored through it to receive the spanwire. Of course, in the ordinary side-pole, span-wire methodof construction, no such device is needed to cushion theblow of a passing… … Fig. 30. GO ELECTRIC RAILWAYS. § 21 tapering to 6 or 7 inches at the top, which should be cut toa conical shape so as to shed water. The pole from theground up may be round or octagonal. Octagonal poleslook better, but poles naturally round last longer. It willbe found to prolong the life of a…
Electrical engineering
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