. American engineer and railroad journal . riG. 2. ever weight is required to make the reciprocating weights forthe large and small cylinders equal. Having determined the weight on drivers and the tractiveeffort, the next step is to provide a boiler of sufficient capacityto supply the cylinders at the speeds required. Fig. 2, the general plan of the locomotive, shows a boiler 80in. in diameter at the first ring and 92 in. in diameter over thelargest course, which will contain about 250 214-in. tubes and27 5^8-i- tubes 21 ft. o in. long. The distance of 4 ft. 6 in. fromcenter of the cylinder to
. American engineer and railroad journal . riG. 2. ever weight is required to make the reciprocating weights forthe large and small cylinders equal. Having determined the weight on drivers and the tractiveeffort, the next step is to provide a boiler of sufficient capacityto supply the cylinders at the speeds required. Fig. 2, the general plan of the locomotive, shows a boiler 80in. in diameter at the first ring and 92 in. in diameter over thelargest course, which will contain about 250 214-in. tubes and27 5^8-i- tubes 21 ft. o in. long. The distance of 4 ft. 6 in. fromcenter of the cylinder to front tube sheet will give ample spacefor the superheater header without obstructing the draft. The3 in. o in. combustion chamber with 21 in. o in. flues and 4 in. from center of cylinder to front tube sheet and the slop-ing throat sheet give ample clearance over the rear drivers. Asuperheater has been included and is of such dimensions aswill probably give about 150° F. superheat and about 20 percent, saving in water FIG. 3. In order to promote free circulation, % in. bridges betweenthe 2}i-m. tubes and V^-m. bridges between the s5^-in. tubeshave been used, although considerably more heating surfacecould have been obtained by closer spacing. The ratio oftractive effort times diameter of drivers to heating surface andof heating surface to cylinder volume compare favorably witha number of recent superheater locomotives and indicate satis-factory steaming qualities. The fact that the combustion cham-ber is practically equivalent to an equal length of tubes shouldbe considered in connection with the ratios involving heatingsurface. the Master Mechanics standard distance of 55 in. between hubson the middle and back drivers. Whatever strains may becaused by the offset in the frames can be more than amplyprovided for in the cast steel crosstie over the middle axle andthe waist sheets extending up to the boiler. To keep the loadfrom the springs central on the driv
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
