. Railway mechanical engineer . us when the main engine is shut off. A removable 497 498 RAILWAY MECHANICAL ENGINEER Vol. 96, No. 9 plate is applied to the smokebox over the supverheater headerto facilitate the tightening of joints when assembling thesuperheater. The Superheater Companys feedwater heateris applied which utilizes a pwrtion of the exhaust steam toheat the feedwater from tank temperature to about 225 , the condensate being returned to the tender. The firebox is supplied with coal by an Elvin stoker andis equipped with the American Arch Companys t)-pe P double firebrick arch
. Railway mechanical engineer . us when the main engine is shut off. A removable 497 498 RAILWAY MECHANICAL ENGINEER Vol. 96, No. 9 plate is applied to the smokebox over the supverheater headerto facilitate the tightening of joints when assembling thesuperheater. The Superheater Companys feedwater heateris applied which utilizes a pwrtion of the exhaust steam toheat the feedwater from tank temperature to about 225 , the condensate being returned to the tender. The firebox is supplied with coal by an Elvin stoker andis equipped with the American Arch Companys t)-pe P double firebrick arch, consisting of two sets of refractorybrick supported on two horizontal rows of arch tubes, eachcomprising four 3>4-in. tubes. This design of firebrickarch is new. Its purpose is not only to ensure completecombustion, but to improve water circulation in the boiler,the chief object of the double rows of arch tubes. Additional economy of steam is secured by the use ofsuperheated steam in the auxiliaries, including the air com-. Slde Elevation and Sectlens of September, 1922 RAILWAY MECHANICAL ENGINEER 499 pressor, feedwater pump, blower, turbo-generator, stoker and to eliminate ever\- pound of unnecessarj weight. Littlelocomotive booster. These accessories at times use more opportunity for reduction was found in the boiler or frames,than 25 per cent of the steam from the boiler. The con- but surprising savings were made in some of the minor de-sumption per unit of work done is quite high and the saving tails. For example, by refinement in design, the foundationby superheating the steam should be relatively large. brake rigging was cut down 1,800 lbs. without sacrificing strength. The use of magnesia laggins; saved several hun- Reduction of Weight and Drnamic Augment dred pounds. One of the reasons for the selection of the Careful attention was given to all the details of design Elvin stoker was its relatively light weight.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
