owly by a locomotive, and were used. struction. The poles are designed to withstand a wire paid out, and the boom was raised at each cross- The underground high-tension cables are of the wind pressure at right angles to the line correspond- arm, so that the wire would drop onto the arm.… … ofthe other set. mission line required that the outlying ends of transmission cables exposed to lightning e+ Ore calculated from data obtained in the Berlin-Zossen The use of concrete masonry probably begins with charges be provided with protective apparatus. Wher- high-speed railway tests, which…
Internet Archive · Public domain (published before 1931). Free to use for anything.
