. Electric railway journal . Fig. 3—Southern Pacific 1200-Volt Lines—High-Tension Transmission Feeder System 902 ELECTRIC RAILWAY JOURNAL. [Vol. XXXVIII, No. 17. the two-track and four-track catenary bridges, wherethey are carried on extensions to the end supports of thebridges, as indicated in Figs. 5 and 7. Every mechanicaland electrical detail of the aerial lines was worked outwith a very high factor of safety to provide for the saltfogs and high wind velocities which are encountered inthe vicinity of San Francisco Bay. Sleet or lightningstorms, however, did not have to be taken into accoun
. Electric railway journal . Fig. 3—Southern Pacific 1200-Volt Lines—High-Tension Transmission Feeder System 902 ELECTRIC RAILWAY JOURNAL. [Vol. XXXVIII, No. 17. the two-track and four-track catenary bridges, wherethey are carried on extensions to the end supports of thebridges, as indicated in Figs. 5 and 7. Every mechanicaland electrical detail of the aerial lines was worked outwith a very high factor of safety to provide for the saltfogs and high wind velocities which are encountered inthe vicinity of San Francisco Bay. Sleet or lightningstorms, however, did not have to be taken into high-tension conductors consist of No. 0000 seven- Voit tW.«s. Fig. 5—Southern Pacific 1200-Volt Lines—Two-Track In-termediate Bridge strand hard-draw n copper. The insulators are of threepieces, of the construction and dimensions shown in Fig. malleable iron galvanized pin for these insulators isshown in Fig. 8. The insulators are made of porcelaincoated with a dark brown glaze. The specifications re-quired that each part of every insulator should withstand atest of 30,000 volts and the complete insulator a test of80,000 volts alternating current applied for one minutecontinuously. The electrical test was made by invertingthe insulator in a shallow pan of water and pouring waterinto the pan, so that the two bodies of water were made toserve as electrodes. One out of every fifty assembled in-sulators was subjected to a mechanical test of 4000 lb
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