File:Image from page 675 of "Railway mechanical engineer" (1916).jpg

English: Identifier: railwaymechanica94newy

Title: Railway mechanical engineer Year: 1916 (1910s) Authors: Subjects: Railroad engineering Engineering Railroads Railroad cars Publisher: New York, N.Y. : Simmons-Boardman Pub. Co Contributing Library: Carnegie Library of Pittsburgh Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Text Appearing Before Image: here to de.scrijje each in detail. The nature of the work, the size or shape of piece to behardened, makes desirable at times the use of different pro-cesses or kinds of heating mediums, as, in addition to the|)lain electric, gas, oil or coke oven, the bath furnace isfound very convenient for long articles, such as stay bolttajfs, long reamers, etc. The material used for the bathusually is lead, or a salt mi.xture, such as barium chloride,etc., each having some advantage over the other. This formof hardening is much in favor for a lot of w^ork done in thetool room, on account of the ability to heat only that portionof the tool desired, and exclude all air from the heatedpart, thereby eliminating danger of scaling, which existswith almost any other means of heating. The quenching of the heated article is an importantoperation and in too many cases is not given the con-sideration and attention it should receive. The tanks shouldbe of ample size and it is often necessary, if much work is

Text Appearing After Image: Hardening and Tempering Room, Illinois Central. Burnside Shops, Chicago gaging apparatus, hardness testing instruments and so forth.There are several types of furnaces which may be used forheating tool steel and the kind .selected would depend con-siderably on the shop conditions and the kind of fuel avail-able. Good results are obtained from furnaces using elec-tricity, gas, oil or hard fuel, such as coke or coal, as heatingmediums; the first two mentioned are no doubt the mostpopular and efficient for tool work. Any fucl-jjurningfurnace for this work should be so constructed that the flamedoes not come directly in contact with the article to behardened. This can easily l)e arranged through use of acombustion chamber in connection with suitable design andconstruction of the heating chaml)er. There are several dif-ferent designs which may be used for each of the differentfuels, but they all should produce as nearly as pos-sible the ideal condition for the heating chamber where theWOk

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