. The Street railway journal . undays, was taken down for overhaul—never havingbeen so much as taken down for examination since its erection, infive years previously. The report states that all the parts werecarefully measured, and the and trunks showed no per-ceptible wear, and were replaced the same as they were taken measuring the cylinders, we found they were 2-ioooths ofan inch larger than our standard size, and the cylinders werethe same; still they were quite round. All piston rings and glandrings were replaced without any repair whatever. The whole ofthe repa
. The Street railway journal . undays, was taken down for overhaul—never havingbeen so much as taken down for examination since its erection, infive years previously. The report states that all the parts werecarefully measured, and the and trunks showed no per-ceptible wear, and were replaced the same as they were taken measuring the cylinders, we found they were 2-ioooths ofan inch larger than our standard size, and the cylinders werethe same; still they were quite round. All piston rings and glandrings were replaced without any repair whatever. The whole ofthe repairs to this engine, including taking down and re-erecting,were executed in twenty-four hours. Similar instances of practi-cally no wear are shown in cotton mill engines. Unfortunately none of the engines doing traction work hasyet been systematically overhauled, but there is no reason to be-lieve that the wear is any greater than in the instances given above,and the fact that they work well is proof conclusive of their power. FIG. 3.—SECTION OF ENGINE to deal with rapidly changing loads. It seems to be often assumedthat an electric traction engine is exposed to exceedingly \iolentshocks, and that the high speed engine with its light moving partsmust be unable to sustain them. In reply to this it must be notedfirst of all that the shocks are much mitigated if not entirely ab-sorbed by the fly-wheel, which affords complete protection to theengine, and that the parts exposed to damage are the armatureand armature shaft. This was proved beyond a doubt at Hobart,where more than once the shafts were twisted off between thearmature and the fly-wheel during short circuits. The trouble wascured by increasing the size of the shaft, and diminishing theweight of the fly-wheel. The illustration in the description of thisstation which appeared in the Street Railway Journal ofAugust, 1894, shows to what mere discs the wheels were no case did the engine sustain damage. In the se
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
