. Electric railway journal . Lines—Messenger Cableand High-Tension Insulators applied horizontally to the tie wire groove. The insulatorsso tested were then broken to inspect the texture of theporcelain. The high-tension strain insulators are of the link typeand are made of one piece of dark brown glazed of this insulator when assembled with the wiresthreaded through the wire holes were required to with-stand a mechanical test equivalent to a pull of 6000 lb. be-tween the wires. The electrical test required these in- sulators to withstand 80,000 volts for one minute continu-o
. Electric railway journal . Lines—Messenger Cableand High-Tension Insulators applied horizontally to the tie wire groove. The insulatorsso tested were then broken to inspect the texture of theporcelain. The high-tension strain insulators are of the link typeand are made of one piece of dark brown glazed of this insulator when assembled with the wiresthreaded through the wire holes were required to with-stand a mechanical test equivalent to a pull of 6000 lb. be-tween the wires. The electrical test required these in- sulators to withstand 80,000 volts for one minute continu-ously applied between the wires. When subjected to a pre-cipitation of Ya, in. of clear water per minute on any sur-face the insulators were required not to break down or arcover at less than 50,000 volts applied between the wires. In the underground sections there is used No. 0000 three-conductor varnished cambric lead-covered cable insulatedwith 7/32 in. of cambric around each conductor and a Sinjle X frame Sir^l* X Frame. Fig. 7—Southern Pacific 1200-Volt Lines—Two-TrackAnchor and Signal Bridge 7/32-in. belt of cambric around the core rounded with jutelaterals, all covered with a 9/64-in. lead sheath. Amongother requirements of the specifications were that thecambric should not deteriorate under the action of moistureor a continued temperature of 150 deg. Fahr.; that thesheath should consist of an alloy of lead and tin contain-
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
