. Official proceedings . ard against the top of the cyhnder. It is nodoubt true that a steel piston working in a cast iron cylinderwill score or cut the latter ;/ fhcy come in contact and with thiscontingency in mind, almost all American designing engineersbolt or rivet a cast iron bull ring to a steel center (See FigureNo. 7), the former being provided with grooves for cast ironpiston rings. Construction have been some noteworthy diversions from thispractice however, particularly on locomotives operated by theNorfolk & Western Railway. One method is to pour molteniron (See F
. Official proceedings . ard against the top of the cyhnder. It is nodoubt true that a steel piston working in a cast iron cylinderwill score or cut the latter ;/ fhcy come in contact and with thiscontingency in mind, almost all American designing engineersbolt or rivet a cast iron bull ring to a steel center (See FigureNo. 7), the former being provided with grooves for cast ironpiston rings. Construction have been some noteworthy diversions from thispractice however, particularly on locomotives operated by theNorfolk & Western Railway. One method is to pour molteniron (See Figure No. 8) into a groove machined in the face ofthe piston. Another is to pour molten bronze in the same man-ner (See Figure No. 9), afterwards turning in a lathe to theproper diameter. Both of these types are said to operateefificiently but it is not the easiest task in the shop to replace theworn down bearing surface as the shrinkage of metals must bewell understood bv the workmen in order to get a tiffht fit. It. ,n ro^fH A,/*
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