. American engineer and railroad journal . .39 inch blast in actual locomotive practice, as well as in the rec-omnieodationa of Zcnner, we have nozzles varyioRin dlame-U;r from 3,5 inches to 5 inches Suppose wc take one with adiameter of* Inches, we must, in accordance with the datagiten by Ihisappartttas. have five stacks with diameters of111 inches. 32 Inches. 40 inches, 48 inches, and 60 inches, sizeswhich naturally are wholly out of the question tor practicalwork. Then, too, tbe smallest stack of the Zeuner apparatusgave values that varied from those obtained from tbe otherlour
. American engineer and railroad journal . .39 inch blast in actual locomotive practice, as well as in the rec-omnieodationa of Zcnner, we have nozzles varyioRin dlame-U;r from 3,5 inches to 5 inches Suppose wc take one with adiameter of* Inches, we must, in accordance with the datagiten by Ihisappartttas. have five stacks with diameters of111 inches. 32 Inches. 40 inches, 48 inches, and 60 inches, sizeswhich naturally are wholly out of the question tor practicalwork. Then, too, tbe smallest stack of the Zeuner apparatusgave values that varied from those obtained from tbe otherlour large ones, yet Zeuner disregarded it in hislnTesclgations, although it approached more nearly than anyol tbe others to locomotive practice: and, in addition, thevacuum was very low, giving a water column of only !»■.,In, with an excess of blast-pipe pressure ol h atmosphere,while In actual locomotive service it iu at least doublethis, with a blast-pipe pressure that is considerably lower. d the t-emabout one-■ivedat the n results i(. of 5,555 inches would result,ture would rise to 331 degrees Fabr,. which whall the true temperature. Nozo and Geoftroyfollowing conclusions: 1. Each length of stack that gives the maximindependent of both the area of the blast nozzle and thepassage lor gases, hut not of the steam pressure, and is butslightly independent of the diameter of the stack. It mustbe from six to eight times that diameter. &. sreater lengthhas no ioflaence. 2. A lunnel-shaped opening to the bottom ot the stackseems to have no marked influence upon the draft, 3. A stack ot suitable length can project down Into thesmokebox to the top row of tubes without injury to thedraft, if the blast nozzle is dropped at the same time; butthe droit is very seriously impaired it tbe lower end of thestack is plunged down into tbe stream of gases. 1. With a proper length of stack—that is, one varyingfrom six to eight times the diameter—the distance of thenozzle from the stack has no
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
