. The Street railway journal . of the insulator. These pins are attached to the apexof the tower or the cross-arm with four ^-in. bolts andare cemented into the insulators at the factory. A No. o, seven-strand, hard-drawn copper cable is usedfor each conductor. This cable is strung on the towerswith a sag of 12 ft. for a 480-ft. span, at 32 degs. F. Thissag corresponds to a normal tension of 300 lbs. in the ca-ble. Where the span varies from this length the sag isshortened or lengthened so as to keep the tension in thecable practically constant. Where heavy strains occur,necessitating a double
. The Street railway journal . of the insulator. These pins are attached to the apexof the tower or the cross-arm with four ^-in. bolts andare cemented into the insulators at the factory. A No. o, seven-strand, hard-drawn copper cable is usedfor each conductor. This cable is strung on the towerswith a sag of 12 ft. for a 480-ft. span, at 32 degs. F. Thissag corresponds to a normal tension of 300 lbs. in the ca-ble. Where the span varies from this length the sag isshortened or lengthened so as to keep the tension in thecable practically constant. Where heavy strains occur,necessitating a double cross-arm, the cable, instead of rest-ing on insulators, is attached to an equalizing saddle todistribute the load equally over several insulators. Thesesaddles are so designed that in case one insulator should bedefective it may be removed and another substituted with-out removing the cable from the saddle. The use of light-ning arresters is confined to the sub-stations themselves. June 8, 1907.] STREET RAILWAY JOURNAL. lOOI. I002 STREET RAILWAY JOURNAL. [Vol. XXIX. No. 21. SUB-STATIONS The four sub-stations previously mentioned are of sim-ilar design. They are of brick with lithoHte trimmings, con-crete roof and concrete floors. They are divided into twomain compartments, at the rear the high-tension room, andin front the converter room. This being one of the first 60,000-volt installations in this riTrtl volt Bu^« = Vollige ictectoraXjlJ TJ
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
