. Railway mechanical engineer . draft; the former lb. per sq. in. and the latter in. of water, producinga draft efficiency of These results might be com-pared with those obtained from the locomotive .whileeciuipped with the standard front end arrangement, wherethe exhaust pressure for run No. 17. Table I was i)er sq. in. while the draft was in. of water andthe draft efficiency only The results from runs , which, except for a difference in the stack flare,had the same front end equipment as used in runs , varied slightly from the results
. Railway mechanical engineer . draft; the former lb. per sq. in. and the latter in. of water, producinga draft efficiency of These results might be com-pared with those obtained from the locomotive .whileeciuipped with the standard front end arrangement, wherethe exhaust pressure for run No. 17. Table I was i)er sq. in. while the draft was in. of water andthe draft efficiency only The results from runs , which, except for a difference in the stack flare,had the same front end equipment as used in runs , varied slightly from the results of runs No. 41-42;the draft and exhaust pressure are both slightly higher andthe draft efficiency slightly lower. The exhaust stack dia-grams for runs No. 41-42 are shown in Fig. 9, and forruns No. 68-69 in Fig. 11. In both instances, the exhaustwas striking well down in the stack, a distance of 35 7/16in. from the top for runs No. 41-42, and 39j>/8 in. for runsNo. 68-69. The successful results obtained from nozzle st\le A-3. ylrea-44 23() Sect Ion/I-B. 13—Plain Annular Nozzle A-4a raised the question as to whether the same satisfactory re-sults might not be obtained from the same type of nozzlewith plain annular ports, and nozzle style A-4 was im-provised for this comparison. This nozzle, which is illus-trated in Fig. 12. was cast off of the same pattern as nozzlestyle A-3 and the ports straightened by machining off ex-cess metal entering within the bounds of the shape of theopening desired. Plates were then applied to bring theopenings to the size desired. This nozzle was used in runNo. 4.^ with the same stack combination as used in con-nection with waffle iron nozzle style A-3. While as satis-factor}- draft conditions were obtained, the average exhaustpressure was increased, resulting in a reduction in draftefficiency as compared with that obtained from nozzle styleA-3. As both nozzles had the same free opening, thereappeared
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
