. Railway master mechanic [microform] . ones. The results to be obtained with a free steamingboiler supplying cylinders comparatively small, whenjudged by the ratios of recent practice, will undoubtedlybe observed very closely and it is believed that the cry ofengine would not steam would be less general in coldwinter weather if the practice of a greater ratio betweenheating surface and cylinder volume was secured by in-creasing the boilers without adding so much to cylinderdimensions. The flues are 2 ins. outside diameter and 15 ft. 1 The necessity for greater adhesion to provide in-
. Railway master mechanic [microform] . ones. The results to be obtained with a free steamingboiler supplying cylinders comparatively small, whenjudged by the ratios of recent practice, will undoubtedlybe observed very closely and it is believed that the cry ofengine would not steam would be less general in coldwinter weather if the practice of a greater ratio betweenheating surface and cylinder volume was secured by in-creasing the boilers without adding so much to cylinderdimensions. The flues are 2 ins. outside diameter and 15 ft. 1 The necessity for greater adhesion to provide in-creased tractive effort has made it desirable to use threepairs of drivers, and as the wide grate has been intro-duced to maintain sufficient steam pressure, many de-signers have used the trailing wheels to carry the rearportion of the boiler. This number of wheels necessi-tates a long boiler, and tubes 20 and 21 ft. long have fol-lowed. In the engine here under consideration, however,. Ten Wheel Passenger Locomotive, C. B. & O. Ry.— Rear Portion of Frame. inous coal will be used as fuel and the maximum boilerpressure will be 210 lbs. The K-5 engine has cylinders of the same dimensionsas the previous engine, 19 ins. di3meter by 26 ins, stroke,but the heating surface has been increased 658 by an addition of 35 tubes, increasing the diameterof the boiler from 62 ins. at the small ring to 66 ins.,and making the back head of firebox vertical instead ofsloping, thus inc easing firebox heating surface and giv-ing more room for water and steam. This increase inheating surface for service in connection with cylindersof the same size appears to be a point well taken, forit should provide a free steamer and at the same timesupply a reserve to draw from in time of emergency,especially so in view of the prevailing tendency to loadengines up to their maximum capacities. The ratio of total heating surface to volume of bothC) linders is 666. While this ratio may a
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