. Electric railway journal . out 600 kvaor 750 kva, but beyond these capacities the weight and size of case become so great thatsome method other than mereincrease in size must be usedto get the necessary radiatingsurface. A case recently hasbeen developed by the West-inghouse Electric & Manufac-turing Company to overcomethis difficulty. It consists sim-ply of a plain boiler-iron caseto the outside of which radiat-ing tubes are welded. Thesetubes are in the vertical posi-tion and are given a at the top and bottomwhere they enter the mechanical constructionis: very strong,
. Electric railway journal . out 600 kvaor 750 kva, but beyond these capacities the weight and size of case become so great thatsome method other than mereincrease in size must be usedto get the necessary radiatingsurface. A case recently hasbeen developed by the West-inghouse Electric & Manufac-turing Company to overcomethis difficulty. It consists sim-ply of a plain boiler-iron caseto the outside of which radiat-ing tubes are welded. Thesetubes are in the vertical posi-tion and are given a at the top and bottomwhere they enter the mechanical constructionis: very strong, so that there ispractically no chance of everSelf-Cooled Transformer springing a leak. Because of the ease with which the tubescan be widely separated from one another, the air circulatesvery freely among them and the efficiency of the radiatingsurface is considerably higher than for the ordinary corru-gated case. Large self-cooled transformers arc of particu-lar value in places where cooling water is not available, very. io74 ELECTRIC RAILWAY JOURNAL. [Vol. XXXIV. No. 20. costly, weather conditions so severe that water-cooled trans-formers may give trouble or where it is desirable to have aslittle attendance as possible. The Westinghouse Electric &Manufacturing Company has just built 12 1000-kva, 100,000-volt transformers of this new type, as shown in the illustra-tion, for the Southern Power Company. Three of thesetransformers are for outdoor service and nine are to beused indoors. AN ELECTRIC TOWER WAGON An interesting application of trackless electric vehiclesfor electric railway service has been developed by the Gen-eral Vehicle Company, of Long Island City, N. Y., in theemergency tower wagon illustrated in Fig. 1. The entireequipment of the tower wagon is mounted on the well-known 2-ton chassis of this builder. All the spring sup-ports and the special parts are vanadium steel castings, andall the renewable parts are accurately machined to striking feature is
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