Journal of electricity, power, and gas . ed at each ground wire support of 5000 lb., also to ahorizontal strain at right angles to the line applied ateach ground wire support of 5000 lb.; also to a horizon-tal strain in the direction of the line applied at theintersection of the middle cross-arm and the cen-ter line of the tower of 9000 lb., and simul-taneously a horizontal strain at right angles to theline applied at each of the points of support of thesix conductors and two ground wires of 500 lb.; alsoto a horizontal strain either at right angles or parellelto the line applied at the center
Journal of electricity, power, and gas . ed at each ground wire support of 5000 lb., also to ahorizontal strain at right angles to the line applied ateach ground wire support of 5000 lb.; also to a horizon-tal strain in the direction of the line applied at theintersection of the middle cross-arm and the cen-ter line of the tower of 9000 lb., and simul-taneously a horizontal strain at right angles to theline applied at each of the points of support of thesix conductors and two ground wires of 500 lb.; alsoto a horizontal strain either at right angles or parellelto the line applied at the center of gravity of all thewires of 12,000 lb. Accompanying the above men-tioned horizontal stresses a vertical strain applied atthe supports of each of the six conductors and twoground wires of 500 lb. The stresses due to its owns weight and to a windpressure in a horizontal direction of 20 lb. per sq. the superficial area of the tower. All members of the towers were galvanized andbolted together. The standard tower is fifty feet from. Map Showing 60,000 Volt Lines of the Washington Water Power Company. 332 JOURNAL OF ELECTRICITY, POWER AND GAS [Vol. xxxn_No. 16 the ground stub joint to the bottom wire at the insu-lator and 192 of these towers weighing 5324 lb. eachused. In addition there were 10-40 ft. towers were 4315 lb. each, ft. towers 6390 lb. each, and 16 5*3? n\ ^y gzB- -\ V| / y/. 2x\x ?C^ fr View of Tower Line Showing Transposition. transposition towers 6467 lb. each. The line is trans-posed through 120 degrees eight times giving threecomplete cycles, and two towers are required for eachtransposition. One hundred and eighty-five towers had anchorposts set in dirt and 43 anchor plates resting on con-crete footings but anchored through the footings tosolid rock by means of wedge holding down bolts. The work of manufacturing- the towers was done
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