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<br />- <br /> <br />~ <br /> <br />I <br />. <br /> <br />I <br /> <br />TRANSMISSION LINES <br /> <br />~.17 <br /> <br />at diff~:Qgt''Pl'ints along the Camino to Iron Mountain section. An <br />excavator ~AS used where the ground was snitable and the re-,' <br />mainder of the excavation was by hand, using compressed-air tools <br />and explosives when needed, <br />As soon as the excavation was well organized and steel as- <br />sembled, the setting and concreting of footings was begun, The <br />type of footing generally used consists of a truncated cone b,lse 3 <br />feet 6 inches in diameter at the bottom, set 7 feet 10 inches below <br />the ground line, supporting a round tapering concrete column 17 <br />inches in diameter at the base and 12 inches at the top. In the cen- <br />ter of the column and extending down into the base is a 4-inch <br />angle which is joined in the base to a grillage of structural steel. <br />This footing stub angle is set at the tower leg batter and projects <br />sufficiently above the concrete envelope to provide a lap joint at the <br />point of attachment of the tower. In order to provide for bending <br />loads the concrete envelope is reinforced by vertical bars spaced <br />around the stub angle and by a %,-inch spiral around the top three <br />feet of footing. Placing of concrete was not permitted when the <br />air temperature was above 95" and all work on footings was sus- <br />pended during the period from June 18th to October 1st due to <br />the intense s.umm.er heal. <br />On May 1, 1936 erection of towers was started immedi:ltely <br />south of Camino on the Camino-Hayfield line. On June 10th one <br />crew started erecting towers in the Danby Dry Lake bed. Here <br />great care was exercised to keep the galvanized steel off the alkali <br />ground as it was found that after only a few hours in contact with <br />the moist soil an appreciable amount of galval)izing was removed <br />by the corrosive salts. <br />On July 21st the stringing of the aluminulll conductor was be- <br />gun south of Camino. Insulators were usually hung by the towel' <br />crews but in some cases the stringing crews hung the insulators, <br />lifting both insulators and stringing sheaves at the same time. In <br />all cases when sheaves were lifted ropes were left therein for pass- <br />ing the lead lines back through the sheaves from the layout tractor <br />when stringing. <br />Aluminum conductor was delivered to the site on reels cont:ain- <br />ing three-fourths of a mile of cable. The reels were spotted in dol- <br />lies adjacent to the end of the p,'evious "pull" and the cable paid <br />out, three conductors at one time, by lead lines some 200 feet in <br />length attached to a tractor. As e;lch tower was reached the lead <br />