. American engineer and railroad journal . er economy by the appli-cation of a superheater, which would give somewhat highertemperatures, coming within the limits of what would be calleda moderate degree superheat. It was also indicated that, allthings being considered, a superheater which does not requireany deformation of the boiler was to be preferred. To answer this purpose H. W. Jacobs, assistant superintendent One of the illustrations gives a perspective view showing thearrangement and connection of the superheater as applied to thislocomotive. It consists simply of two steel drums, fitt
. American engineer and railroad journal . er economy by the appli-cation of a superheater, which would give somewhat highertemperatures, coming within the limits of what would be calleda moderate degree superheat. It was also indicated that, allthings being considered, a superheater which does not requireany deformation of the boiler was to be preferred. To answer this purpose H. W. Jacobs, assistant superintendent One of the illustrations gives a perspective view showing thearrangement and connection of the superheater as applied to thislocomotive. It consists simply of two steel drums, fitted with aseries of horizontal fire tubes between the heads, located in thefront end and the necessary steam pipe connections. In theearlier stages of the development of the superheater considerableexperimental work was done to determine the proper diameterof fire tubes for the most satisfactory results. These Tesearchesindicated very strongly the superiority of the 2]/^ in. tubes,which have since been used. The shells of the two drums are. CfnderHopper- Valve Chamber Head Valve Chamber ^/tension-JACOBS SUPERHEATER AS APPLIED TO TANDEM COMPOUND LOCOMOTIVE NO. QOI. of motive power, designed a fire tube drum type superheaterwhich was applied to a locomotive in November, 1908. After alittle over a years performance the results indicated the superiorqualities of this superheater over the low degree superheateras applied to other engines of the same class, and since thattime the Jacobs superheater has been applied very generally tolocomotives on the Santa Fe. Since a large portion of the locomotives on this road are oftbe compound type, the superheater has been arranged in twoparts, one drum being ahead of the exhaust pipe for superheat-ing the steam on its way from the boiler to the high pressurecylinders and the other larger drum, located between the exhaustpipe and the front flue sheet acting as a reheater (see AmericanEngineer, December, 1909, page 481). In June, 1909, engine 901
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
