. American ENGINEER and Railroad journal . rous et où l'eau conditionne le pire. Le service de ces enginewa a regardé attentivement, et il a été trouvé être une grande amélioration. En dépit du factqu'il y avait eu une réduction considérable dans le service de chauffage réel, le moteur a été trouvé à la vapeur aussi bien avec ceux qui hav-ing une plus grande surface de chauffage réel, et, en outre, ce moteur a exigé seulement aboutone-quaiter autant de travail à faire sur les theflues, et cela sur une division où les conditions d'eau étaient notoirement mauvaises. Quel travail était nécessaire les Fils pourraient être faits sans re
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. American engineer and railroad journal . rous and where the water conditionswere the worst. The service of this enginewas watched carefully, and it was found tobe a large improvement. In spite of the factthat there had been a considerable reductionin actual heating service, the engine wasfound to steam equally well with those hav-ing a greater actual heating surface, and, furthermore, this engine required only aboutone-quaiter as much work to be done on theflues, and that on a division where the waterconditions were notoriously bad. What work was necessaryon the flues could be done without removing the brick arch, which is an economy not only in money, but in time as well.It was also found that there was no collection of cinders inthe combustion chamber and that the flues were all open.That the service of this engine was eminently satisfactoryfrom all standpoints is best evidenced by the fact that com-bustion chambers have been specified on all of this last orderof 70 engines, which include passenger as well as freightengines.. :° »° °i lion rhjinibfr Noll.Kit WITH COMBUSTION CHAMBER, PACIFIC TYPE LOCOMOTIVE—■ NORTHERN PACIFIC RAILWAY. point at the sides, which will probably prove to be sufficientto furnish the required circulation for the firebox side sheetsand back head. The inner throat sheet meets the combustionchamber ring in a curve of long radius, and the brick archoccupies its usual position from the throat sheet diagonallyupward. Reference to the accompanying table I. will show the re-duction of actual heating surface which the combustion cham-ber has made in both the Pacific and Mikado types. It iswell known that a square foot of heating surface in the fire- Pacific Without 4.6 7.140.4 lbs.62.0 lbs.81 4.345.35 % 965.3 sq. ft.148 lbs.22.2 607 2.220 11.4 cu. ft. 310S4.S 3.8 111 Pacific With 4.72 7.2 49.2 lbs.75 lbs.68.5S.538.1% 910.6 sq. fl161 lbs.217202.35011.4 cu. fl26179.83.8100.5 Mikado.Without4.25.5548.3 lbs.63.5 lbs.93.54.85.15 % 1, 070.2 sq. ft
