. The street railway review . of delivering a continuous service of 225 amperes, at apressure of 500 volts, which is equal to a total output of112,500 watts. Besides this, the reserve capacity is 30per cent. abo\e the normal in current and voltage. is formed of this sheet iron wound spirally on the founda-tion ring and riveted firmly together. The outside cir-cumference of the ring is somewhat wider than theremainder, and this portion is milled out into notchesforming a modified Paccinotti ring. The coils are thenwound on the core around the hollow ring, the methodbeing such that each of the 2
. The street railway review . of delivering a continuous service of 225 amperes, at apressure of 500 volts, which is equal to a total output of112,500 watts. Besides this, the reserve capacity is 30per cent. abo\e the normal in current and voltage. is formed of this sheet iron wound spirally on the founda-tion ring and riveted firmly together. The outside cir-cumference of the ring is somewhat wider than theremainder, and this portion is milled out into notchesforming a modified Paccinotti ring. The coils are thenwound on the core around the hollow ring, the methodbeing such that each of the 200 coils is entirelj- exposedto the air on all sides, thus securing the perfect ventilationwhich is obtainable in no other type of armature. Theprojecting coils, are in fact a sort of a fan, and in stand-ing before the machine the current of air set in motion bythe armature can be detected ten or fifteen feet a consequence, both armature and field run cool, andit is almost impossible to burn out a coil even with heavy. SHORT RAILWAY GENERATOR. The field magnet frame weighs 8,000 lbs. and is of thesoftest and purest iron. Light field magnets are boltedto this frame, carrying shunt and series coils and providedwith pole pieces of peculiar shape, arranged for side pre-sentation to the armature, and so disposed as to make apowerful and almost perfectly uniform field of force,with a narrow magnetic gap of large diameter. The armature revolves within this space, which is apeculiar feature of the machine. Upon a shaft nine feet long by six inches in diameter,is keyed a massive spider, carrying the foundation ringupon which the armature is built up. The armature core overloads. Moreover, the destruction of a single coildoes not affect adjacent coils, and it is even possible, incase of necessity to run the machine for several dayswithout rewinding a burned out coil, a feat absolutelyimpossible with any type of Siemens armature. Aburned out coil can be wound by any good mechanic
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
