. Electric railway journal . The steel towers were built by the American Steel Companyof Cuba. They came through the October hurricane withouta single instance of failure or bending. A number of built-up steel poles of other types used in the service of other com-panies were bent double by the same storms. The steel towersare built in three sections, two of which when assembled anderected project 30 ft. above the ground, while the three sec-tions make a tower 49 ft. 6 in. high above ground. The cross-arm is a 6-in., 8Tb. steel channel, 7 ft. 10 in. long with five holespunched 23 in. apart to r
. Electric railway journal . The steel towers were built by the American Steel Companyof Cuba. They came through the October hurricane withouta single instance of failure or bending. A number of built-up steel poles of other types used in the service of other com-panies were bent double by the same storms. The steel towersare built in three sections, two of which when assembled anderected project 30 ft. above the ground, while the three sec-tions make a tower 49 ft. 6 in. high above ground. The cross-arm is a 6-in., 8Tb. steel channel, 7 ft. 10 in. long with five holespunched 23 in. apart to receive the insulator pins and theground wire eyebolts, and is bolted to the flat surface formingthe top of the tower. The high-tension cables and the feeder cables are carriedby the steel tubular poles which support the span wrres carry-ing the trolley wires. The feeder cables were originallyrun through conduit laid along the tracks in various parts ofthe city, but since the beginning of the sewer and paving work. Havana Electric Railway—Interior of Substation they have been withdrawn from the ducts and are now beingcarried overhead. Steel bands clamped to the top of the poles,holding a wood block with ordinary 2-in. porcelain knob laidon its side, carry a 7/16-in. galvanized steel messenger cable,from which the feeder cable is suspended by zinc clips spaced24 in. apart. This form of construction, common in telephonework, was deemed necessary by the frequent joints in thecables, which it was believed greatly decreased the mechanical strength of the latter. The arrangement adopted has provedto be very satisfactory. DOUBLE TROLLEY SYSTEM The double trolley system is used throughout the HavanaElectric Railway Companys lines, and while it multiplies thenumber of overhead wires and always necessitates the pres-ence of the car conductor on the rear platform at curves andspecial works in order to guide the trolleys, no difficulty in op-
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