. Electric railway journal . gnal catenary bridgesare built up of towers and trusses as shown, with the sameclearances and overhead arrangements as the intermediate October 28, 1911.] ELECTRIC RAILWAY JOURNAL. 941 bridges. The drawings show the positions of the woodencross-arms for carrying high-tension transmission lines,signal cables and telephone wires, etc., with provision forcarrying a duplicate high-tension line on the opposite 14 and 18 respectively are views of a four-trackanchor and signal bridge at a curve and of a four-track in-termediate bridge over tangent track. The br
. Electric railway journal . gnal catenary bridgesare built up of towers and trusses as shown, with the sameclearances and overhead arrangements as the intermediate October 28, 1911.] ELECTRIC RAILWAY JOURNAL. 941 bridges. The drawings show the positions of the woodencross-arms for carrying high-tension transmission lines,signal cables and telephone wires, etc., with provision forcarrying a duplicate high-tension line on the opposite 14 and 18 respectively are views of a four-trackanchor and signal bridge at a curve and of a four-track in-termediate bridge over tangent track. The bridges were The standard tubular poles are made of three sections oflap welded tubing, the sections being hot-swaged togetherwith not less than 18-in. overlap at the joint. The specifi-cations required that the poles satisfy the following oper-ating conditions: Pole spacing, 120 ft.; pole length, 30 ft.,with 6ft. set in concrete on two pieces of 2-in. x 12-in. x 24-in. redwood ; diameter of steel messenger, 7/16 in.; diameter. Fig. 18—Southern Pacific 1200-Volt Lines—Four-Track In-termediate Bridge at Curve fabricated by the American Bridge Companv from SouthernPacific designs. Figs. 19 to 26 show the several types of steel pole spanside and center construction which are used in operatingever public streets. The clearance between the top ofthe rail and the trolley is 22 ft. throughout. The poles forside construction are 34 ft. long and for center pole con- EUcu-ic H>J--Journal Fig. 20—Southern Pacific 1200-Volt Lines—StandardDouble-Track Span Construction of feeder, in.; size of trolley wire, No 0000; approxi-mate weight of messenger, trolley wire and hangers, 1 V-> foot; approximate weight of feeder, 1^ lb. per pole has a protecting sleeve at the ground line. Thissleeve is 24 in. long and 6 in. of it extends into the concretefoundation. It was specified that in a 60 windstormat right angles to the track these poles must not have
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