. American engineer and railroad journal . too large for the smallerengine. It is, in fact, the practice of some roads to makepractically all stacks of the same diameter, without referenceto the size of the engine upon which they are used. In suchcases it is not likely that stacks are often given dimensionssuch as are required for highest efficiency. Moreover, con-ditions such as have been described do not prevail from choice,but rather because the information which will serve to guidepractici along more logical lines is not available. There isurgent ieed for facts. So far as we can see, the s
. American engineer and railroad journal . too large for the smallerengine. It is, in fact, the practice of some roads to makepractically all stacks of the same diameter, without referenceto the size of the engine upon which they are used. In suchcases it is not likely that stacks are often given dimensionssuch as are required for highest efficiency. Moreover, con-ditions such as have been described do not prevail from choice,but rather because the information which will serve to guidepractici along more logical lines is not available. There isurgent ieed for facts. So far as we can see, the stack willnever be omitted from the steam locomotive, and it is but rea-sonable to expect that in each individual case some particulardiameter, length and contour will give a more efficient resultthan other dimensions or contour. Upon this theory, the pres- Febrdaby, 1902. AMERICAN ENGINEER AND RAILROAD JOURNAL. 88 ent research has been promoted. It has been the expectationthat it would serve to develop a sufficient array of facts to con-. nection therewith is not the one upon which the experiments were made. 3. The stacks employed in the experiments, asdesigned by Mr. H. H. Vaughan, and as constructedunder the direction of Mr. W. H. Marshall, Super-intendent of Motive Power of the Lake Shore &Michigan Southern Railway, at the Elkhart shopsof that road, are shown by Figs. 2 and 3. Theillustrations are from photographs taken beforethe work began. Fig. 2 embraces four differentdiameters of straight stacks, and Fig. 3 four dif-ferent diameters of taper stacks. Each stack ismade in sections, by the successive removal ofwhich any desired length within the limits shownmay be obtained. The nozzles used in connection with the differentstacks are shown by Fig. 4. These were designedby Prof. William Forsyth and, like the stacks,were constructed under the direction of Mr. W. When in use the nozzles stand upona short exhaust pipe, designed in accord with therecommendation of the
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