. American engineer . of superheatingarea. There are 282—214 in. tubes and 45—5/^ in. tubes, 24 in. long between tube sheets, which together with the fire-box give an evaporative heating surface of sq. ft., and anequivalent heating surface of sq. ft. It was desired to use a steam pressure of 160 lbs., and com-pound cylinders of sufficient size to develop the capacity of theboiler would make the low pressure cylinders too large to pass theclearance limits. Furthermore, by the use of high-degree super-heated steam it was thought that there would be no loss ineconomy from the
. American engineer . of superheatingarea. There are 282—214 in. tubes and 45—5/^ in. tubes, 24 in. long between tube sheets, which together with the fire-box give an evaporative heating surface of sq. ft., and anequivalent heating surface of sq. ft. It was desired to use a steam pressure of 160 lbs., and com-pound cylinders of sufficient size to develop the capacity of theboiler would make the low pressure cylinders too large to pass theclearance limits. Furthermore, by the use of high-degree super-heated steam it was thought that there would be no loss ineconomy from the absence of the compounding, and thereforefour simple cylinders, 27 in. x 28 in., were applied. This ar-rangement, of course, necessitates the carrying of a high pres-sure pipe from the superheater connection in the front end backto a swivel joint near the pivot pin and then forward to thecylinders on the front engine. This has been so carefully de- 3S , 19k. y pai- 1 A h ■8 Q 1 11. , ....-,,... tAmrj. T t-H-^ n. -5 1^1 Y-^?--^— -ni- ; : ■ 1 ; ; > 1 < \ 1:^ \ \ • I \<.--j)0A^---7l0--if---7V---^-Si--\j i j .fi I y. sYs- -J i <Y^l!gJ^ 88Z!^ H ] ji General Arrangement of the Simple Articulated Locomotive for the Pennsylvania. properly. The question arises as to what parts should receivethe periodical overhauling. This depends on the class of engineshandled and the service in which they are used. A study ofengine failure records will also help to determine this. During an experience of about 12 years as an engine houseforeman, at points where engines in througli and local passengerservice were handled, I found that after an engine had madeabout 25,000 miles the valve motion, especially on enginesequipped with the Stephenson gear, would be considerably wornand in a condition where it should be overhauled. The brakerods, hangers, pins and connections would be found to haveconsiderable lost motion and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
