. American engineer and railroad journal . ghest percentage of scale wasof scale taken from an express passenger locomotive runningon the left bank of the Rhine Railway. If now a layer ofscale of the same thickness was spread over both the corru-gated flue and a copper firebox it is evident that the same tem-perature must exist in both cases. The temperature could notreach 1,100° F., since at that point the tensile strength of the FAYS ENGINE VALVE. It is well known that one of the defects of the ordinaryHowe or Stephenson link-motion valve-gear is that when work-ing at short points of cut-off
. American engineer and railroad journal . ghest percentage of scale wasof scale taken from an express passenger locomotive runningon the left bank of the Rhine Railway. If now a layer ofscale of the same thickness was spread over both the corru-gated flue and a copper firebox it is evident that the same tem-perature must exist in both cases. The temperature could notreach 1,100° F., since at that point the tensile strength of the FAYS ENGINE VALVE. It is well known that one of the defects of the ordinaryHowe or Stephenson link-motion valve-gear is that when work-ing at short points of cut-off it causes an excessive amount ofcompression in the cylinder by the premature closing of theexhaust some time before the piston has completed its object of Fays engine valve is to reduce the amount ofthis compression. This is effected by means of supplementarysteam ports and passages in the valve and cylinder, whoseconstruction and arrangement is shown in the engravingsherewith. Fig. 1 is a longitudinal section of a locomotive. Fig. 16. ISTAYLESS BOILER WITH FLEXIBLE BACK HEAD, copper would disappear, and the stay bolls would be strippedout of the crown-sheet. We may take 925° F. as the highestpossible limit of this temperature, and even here the tensilestrength of the copper is only 7,100 lbs. per square inch, andwe are well warranted in thinking that it would strip off thestay-bolts. At this same temperature of 1125 the tensile strength ofwrought iron is 42,600 lbs. and the limit of elasticity 1 1,300lbs., so that with a steam pressure of M atmospheres, as wehave had in this case, we would not expect to tind any defor-mation ; and even at 1,800°, where the metal begins to show adark-red color, it still has a tensile strength of 14,200 lbs. persquare inch, which is still sufficient to resist the pressure pro- cylinder, and valve, the portion on the left-band side of thecentre line A B being drawn on the lines .I 1 2 B of tig. the portion on the right side o
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
