Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 19
at 57,000 ^f volts. The poles are of cedar, 11 m to 23 m long, and 23 cm to 30 cm in diameter at the top. The cross arms are of Oregon fir, and the insulator pins are of oak, boiled in paraffin. f R Fig. 2.—Cross Arms andBraces used by MissouriEiver Power Company 312 Line Poles — Linseed Oil The… … Fig. 4.—Wooden Line Pole of tlie Milano-Varese-Porto-Ceresio Kailway Insulator pins, when of wood, are preferablyof locust, though euca-lyptus and oak arealso largely used. Aninsulator and pin forextra h pr, is illus-trated in fig. 5. Wooden poles aresometimes used inAmerica and on theContinent to…
Electrical engineering
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
