. Electric railway review . where employes congre-gate, thus creating friendly rivalry for efficiency percentages. ARMATURE SPIDER FOR DIRECT-CURRENT GENER-ATOR, BOSTON ELEVATED RAILWAY. The illustration here reproduced shows the armaturespider for one of the two 2,700-kilow^att Allis-Chalmers direct-current railway generators for the extension of the Lincolnwharf power station of the Boston Elevated Railway Company. The new machines, which equal in size and capacity anyof similar type in the country, will furnish a portion of thepower used for operating the elevated railway division andthe ca
. Electric railway review . where employes congre-gate, thus creating friendly rivalry for efficiency percentages. ARMATURE SPIDER FOR DIRECT-CURRENT GENER-ATOR, BOSTON ELEVATED RAILWAY. The illustration here reproduced shows the armaturespider for one of the two 2,700-kilow^att Allis-Chalmers direct-current railway generators for the extension of the Lincolnwharf power station of the Boston Elevated Railway Company. The new machines, which equal in size and capacity anyof similar type in the country, will furnish a portion of thepower used for operating the elevated railway division andthe cars through the East Boston tunnel. These units are of the multipolar type, compound woundfor 575 volts, at a speed of 75 revolutions per minute. Theywill be driven by vertical cross-compound engines, on whoseshafts the armatures, 2114 feet in diameter, because of theirsize, will have to be built up on the ground. The armature core is formed of punched steel laminations,mounted on a cast spider. The rings are made up of seg-. Armature Spider for 2,700-Kilowatt Direct-Current Generatorfor Boston Elevated Railway. ments, which are built up on the spider in such a way as toobtain great strength. An open construction and ample airpassages throughout the core insure thorough ventilation. Thus the heat in the armature is dissipated as fast asgenerated, permitting heavy overloads to be carried withoutdangerous heating. The armature coils are held in place bywooden wedges, a method which does away with the necessityof band wires. An Allis-Chalmers brush oscillating device willbe provided, by means of which the brushes travel back andforth on the commutator in a direction parallel with the engineshaft, keeping the commutator in perfect condition and avoid-ing the usual wearing of grooves. These machines are designed to endure sudden changesin load of any amount from zero to the extreme limit ofcapacity without shifting the brushes. The armature spiders,as indicated in the picture, are ma
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
