. Railway mechanical engineer . elevel, straight track, exclusive of the locomotive. The trolleyvoltage is 1,200. They are of the two-bogie t>pe, each bogiecarrying a 125-hp. motor. Drafting Modern Locomotives N. & W. Tests; a Comparison of the Best Resultswith the Various Nozzle and Stack Arrangements BY H. W. CODDINGTON J^^ Engineer of Tests, Norfolk & Western, Roanoke, Va. THE results obtained from the annular nozzles constructedon a 14-in. diameter circle led to still further develop-ments, and an annular nozzle conforming to a circle was designed, as the results with the
. Railway mechanical engineer . elevel, straight track, exclusive of the locomotive. The trolleyvoltage is 1,200. They are of the two-bogie t>pe, each bogiecarrying a 125-hp. motor. Drafting Modern Locomotives N. & W. Tests; a Comparison of the Best Resultswith the Various Nozzle and Stack Arrangements BY H. W. CODDINGTON J^^ Engineer of Tests, Norfolk & Western, Roanoke, Va. THE results obtained from the annular nozzles constructedon a 14-in. diameter circle led to still further develop-ments, and an annular nozzle conforming to a circle was designed, as the results with the nozzlesconstructed on a 14-in. diameter circle did not indicate thatany limiting conditions in diameter had been reached. Thisnozzle, which is designated as waffle iron nozzle, style A-S, isshown as Fig. 14. It was tested out in runs No. S4-55 with a22-in. diameter stack and a 26^-in. inside extension. Inthis size of stack, the exhaust column missed the stack atthe top by an average distance of 3/16 in., though closely. ror Squf^^ol^ D!^/e) SecfonA-B. Seci>onC-0. Fig. 14—Waffle Iron Nozzle A-5 hugging the walls of the stack for the upper half of itspassage. The exhaust stack diagram for this combinationis shown in Fig. IS. The draft conditions were not nearlyso favorable as those obtained from either waffle iron nozzle,style A-3, or plain annular nozzle, style A-4a, and the draftefficiency of was much lower. This nozzle was latertried with a 20-in. diameter stack in runs No. 64-65. Whilethe exhaust filled the stack at an average distance from thetop of 42J^ in., no improvement in draft condition The draft efficiency was identical with that ob-tained from the same nozzle when used with a 22-in. diam-eter stack. The exhaust stack diagram for this nozzle withthe 20-in. stack, is shown in Fig. 16. In a further effort to find the proper stack to combinewith nozzle style A-S, a 26-in. diameter stack with a 26^-in. inside extension was applied. This com
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