. Railway mechanical engineer . it to becomesolid very slowly which would allow most of the hard com-bined carbon to change to soft graphitic carbon and thusavoid the chill. The welder should remember this when he attempts toweld a combined soft and chilled iron casting. If he heatsthe chilled iron to the molten condition and covers it as isthe custom for ordinarj- castings, the part melted by thetorch, and the weld, will be as soft as the rest of the correct way is to leave the melted chilled-iron pait ofthe weld uncovered so that it will cool down quickly in theair, while the sof
. Railway mechanical engineer . it to becomesolid very slowly which would allow most of the hard com-bined carbon to change to soft graphitic carbon and thusavoid the chill. The welder should remember this when he attempts toweld a combined soft and chilled iron casting. If he heatsthe chilled iron to the molten condition and covers it as isthe custom for ordinarj- castings, the part melted by thetorch, and the weld, will be as soft as the rest of the correct way is to leave the melted chilled-iron pait ofthe weld uncovered so that it will cool down quickly in theair, while the soft-iron part of the casting is covered andcooled si owl v. Radius-Planing Tool An efficient radius-planing tool for machining extendedpiston rod guides and other similar work is illustrated here-with. The principle of operation of this tool will be readilyapparent from the illustration in which the main body of thetool B is held in the planer tool [wst by clamjis on thetool shank S. The tool head T is so arranged as to Pianino the Radius of An Extended Piston Rod Giiulu the cutting tool beiiii; held in this head and adjusted lo sudla length as will give the re(|uired radius. The revolutionof t(xjl head 7 is obtained by means of handle // whichturns rod A and a worni and worm wheel within the bodyof the to^il. Ilie feed of the (ultiiig tool is obviously iili-tained by turning handle // a fraction of a revolution foreach stroke of the i>laner. This device has lieeii in servicefor a long time with satisfactory results. On the particularjob illustrated it planed the exfeiided piston rod guide mill., .U) min. being reiiuired for the roughini, ail andapproximately min. for the finishing cut. 598 MECHANICAL Vol. 96, No. 10 Quality of Steel Determined byFracture Test* By W. J. Priestley THE bulk of steel entering into finished machine parts inthis country is forged, heat treated and machined inother plants than the plant in which it is melted an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
