International Library of Technology · Scranton, International Textbook Co. · leaf 126
elyused for underground wires. The sections shown in Fig. 12are usually 8 feet long and are made as follows: A tube ismade of thin wrought iron, No. 26 B. W. G., .018 inch thick io ELECTRIC TRANSMISSION. a is and securely held by rivets 2 inches apart. The tube isthen lined with a wall of Rosendale…
Electrical engineering
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