. American engineer and railroad journal . west position, the air chamber itself act«d asi asort of stack, and it became possible, with the stack re-moved, (o obtain a vacuum equivalent to 4 in. waterpressure. In order, therLforu. to render exact work pOHSlble. and forwhich purpose it became necessary to place a cap over themouth of tbe pipe leadinn from tbo boiler, the location badto be obtained by more convenient means. The distance ofthe nozzle in que-^tion cban^ed without actu-ally altering the position of the no«le itself, by changingthe positiou of the stuck by putting welded rings in be
. American engineer and railroad journal . west position, the air chamber itself act«d asi asort of stack, and it became possible, with the stack re-moved, (o obtain a vacuum equivalent to 4 in. waterpressure. In order, therLforu. to render exact work pOHSlble. and forwhich purpose it became necessary to place a cap over themouth of tbe pipe leadinn from tbo boiler, the location badto be obtained by more convenient means. The distance ofthe nozzle in que-^tion cban^ed without actu-ally altering the position of the no«le itself, by changingthe positiou of the stuck by putting welded rings in betweenits foot and the air chamber. These rings were welded outof, inch plates, and were of the form shown in Fig witc 10 of tbcte rings, startintt with one inch inheight and iucreasing in height by inch. By seitingaev-cral rings on top of one another, the distance of the aoz«lefrom tbe lower end ol the stack could be increased up to 3o During the tests the joints between ifae rings were well. Fig. Uiod In the Hanover Smoke-Stack Eiptrimenti. mpany, and continued 1 til the autii I of The apparatus used Is shown in Fig. 12. It cousista essenliatly of a lowersteuoi chamber and an upper air steam pipe with a diameter of (l.:t in., passed air tlgbtthrough tbe plate separating the two chambers and carriedthe nozzle at its upper end, this piece baviug nn npeninuranging from in to 5,5 in. The stacks subjected to theinvestigation had a diameter of 17,7 in., and were placedover the circular opening cut in the top aheot of the airchamber. On the four sides there were four air of tbesame sue. It was the original intention to Investigate I hecITecl of variouspotitiona of the oozkIb relatively to thelower end of rhe slack, and to do this by raising or loweringthe nozzle through the means alVorded liy the apparatus il-lustrated in Fig. 12, But it developed that when the nonzle ■ Paper road thotoroTliu Gcrnmo Socioly of Meehanie
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
