. Locomotive engineering : a practical journal of railway motive power and rolling stock . P. Fitzgerald, the foremanblacksmith at the Springfield shop of theBoston & I^Iaine Railroad, was his methodof tempering. This as much as anj-thingshowed him to be a careful, thoughtfulmechanic, and his work in this line is ex-tremely interesting. They had been having trouble breakingthe springs used in holding metallic pack-ing rings in place, and he experimented tofind a remedy. With ordinary temperingthey would either be hard enough to breakor just soft enough to retain a slight setafter being compres
. Locomotive engineering : a practical journal of railway motive power and rolling stock . P. Fitzgerald, the foremanblacksmith at the Springfield shop of theBoston & I^Iaine Railroad, was his methodof tempering. This as much as anj-thingshowed him to be a careful, thoughtfulmechanic, and his work in this line is ex-tremely interesting. They had been having trouble breakingthe springs used in holding metallic pack-ing rings in place, and he experimented tofind a remedy. With ordinary temperingthey would either be hard enough to breakor just soft enough to retain a slight setafter being compressed. Both were bad,but the happy medium seemed to keep justout of reach. Then he tried the oil bath and ther-mjtneter. and began experimenting. Heput a crucible of linseed oil over a forgefire and heated it to the desired point, test-ing with a thermometer which reads to700 degrees Fahr. After considerable experimenting, hefound that with Howe, Brown & steel a temperature of 610 degreesgave the best results. This is also anaverage for other steels, this merely being. A HEAVY SWITCHER. H. K. PORTER and the duty of the engines was reportedevery week, and at some mines every produced, simultaneously, an emula-tion among the engine makers, the pro-prietors and the workmen, each of whomwas ashamed of being outdone by hisneighbors; and from their joint care andexertions, and most especially that of thefiremen, resulted that extraordinary econ-omy for which Cornish engines are sojustly famed. The plan followed was tokeep their fires bright, coking the coal infront, and when sufficient boiler space wasgiven, the proper management insured, nosmoke-consuming patents were necessary;and he felt fully persuaded that if the pro-prietors of steam engines in Manchester the kind he was using, .-^s soon as the oilreaches this temperature he takes thecrucible from the fire and lets it cool downas it will. In testing the springs he putthem under a steam hammer and held
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
