Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . SHCTIONyAA |- 6^-0^ 6-0^6-Cf-^ III III SECT/OtiBB -/4-0 >• :.H .,1 ..-i:, cii i--^- Fig. 39. Plan and Elevation of Steel Tower. greater reliability. The first cost varies from two to four timesthat of wood-pole line construction. These towers take a largevariety of forms, one of which
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . SHCTIONyAA |- 6^-0^ 6-0^6-Cf-^ III III SECT/OtiBB -/4-0 >• :.H .,1 ..-i:, cii i--^- Fig. 39. Plan and Elevation of Steel Tower. greater reliability. The first cost varies from two to four timesthat of wood-pole line construction. These towers take a largevariety of forms, one of which is shown in Fig. 39. They are spaced8—12 to a mile on straight work and range in height from 40 to 60feet, the higher towers being used for the longer spans. There is asaving in the number of insulators required over the number neces-sary for wood-pole lines. For protection and appearance thematerial of the towers is galvanized. 72 POWER TRANSMISSION 63 Cross=Arnis. The best cross-arms are made of southern yellowpine, although oak is used to a large extent. They should be ofselected well-seasoned stock. The usual method of treatment is topaint them with white lead and oil. The size of cross-arms andspacing of pins have not been thoroughly standardized. For cir-cuits up to 5,000 volts, 3|- by 4|-inch cross-arms with spacing betweenpins of 12 or 14| inches, and the pole pins spaced 22 inches, are recom-mended. For higher voltages
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
