. The street railway review . capacity, and is installed at block 40. Machinery Building. Louis-iana Purchase Exposition, and direct connected to a , cross compound engine. The rated output is ,25 cycles. volts, running at S3 r. p. m. The power generatedis used for operating the large pumps furnishing water for theCascades. Like all standard alternators built by the National ElectricCo. this is of the revolving field type, leaving the armature sta-tionary and easily accessible and the difficulty of properly insu-lating the armature coils is eliminated as the w
. The street railway review . capacity, and is installed at block 40. Machinery Building. Louis-iana Purchase Exposition, and direct connected to a , cross compound engine. The rated output is ,25 cycles. volts, running at S3 r. p. m. The power generatedis used for operating the large pumps furnishing water for theCascades. Like all standard alternators built by the National ElectricCo. this is of the revolving field type, leaving the armature sta-tionary and easily accessible and the difficulty of properly insu-lating the armature coils is eliminated as the windings are notsubject to any mechanical strains whatever. The revolving fieldis of large diameter giving additional fly-wheel effect to the engineand the construction of the field coils make them practically in-destructible. All parts are accessible and the method of ventila-tion insures low temperatures. The revolving field is made of cast steel in halves, which arebolted and secured together by shrunk links. The rim of the. HOO-KW NATIONAL CO. wheel li a channel in cross section to which the cast steel polepieces are boKed. The field coils comprise turns of 1 Rlrap. wound on edge and thoroughly insulated, the outeredge of the roll being to the atniophere for pole shoes are secured to the ends of the pole piecesand Herve to bold the field colls in position. These shoes cover alaraie polar arc. distributing the magnetic fiux evenly. The field lOlls are Insulated from thn pole plcics by fuller boardand the pole shoes and spider ring, by heavy fiber. The revolvln*;field iH 10 ft. In diameter and weighs aiiproxlmately . lb. The frame is a circular cast Iron housing Into which laminatedpunihlngs with Inwardly projecting teeth are assembled, for thereception of the armature windings. The frame is exceedinglyheavy and stiff, pot requiring any external support and Is dividedhorizontally, the halves lielng firm
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
