. Railway mechanical engineer . li .T- _^2» ^^ 1^22=. ^ (pprox. f<fuiK fc 7 ) Fig. 6—Plain Annular Nozzle A-1 Sechon ^-B. column more nearly tilled the stack than in runs No. 14-15where the bridge was employed. This feature of the exhaustin run No. 16 is no doubt responsible for the slightly in-creased draft efficiency which has been recognized, as it hasbeen observed throughout this series of tests that the draftconditions are improved when the relation of the exhaust Table II gives further information in connection with theoperating conditions of the test and some of t
. Railway mechanical engineer . li .T- _^2» ^^ 1^22=. ^ (pprox. f<fuiK fc 7 ) Fig. 6—Plain Annular Nozzle A-1 Sechon ^-B. column more nearly tilled the stack than in runs No. 14-15where the bridge was employed. This feature of the exhaustin run No. 16 is no doubt responsible for the slightly in-creased draft efficiency which has been recognized, as it hasbeen observed throughout this series of tests that the draftconditions are improved when the relation of the exhaust Table II gives further information in connection with theoperating conditions of the test and some of the results ob-tained. Still directing attention to the results in group A, itis observed that the operating conditions were very uniform,as far as the number of cars and tonnage in the train wereconcerned. Under item No. 24 the amount of water used for. orox. Bquiif. .■o 7z Diam. Cirfe) Ss:fion /l-B. Fig. 8—Waffle Iron Nozzle A-2 each run is shown. This represents the steam consumed bythe locomotive and accessories, such as air pumps and stokerengine. Special care was taken to see that no waste of steamoccurred through the safety valves during the test. By ob-ferving the intensity of the draft in the locomotive front endbetween the baffle plate and the front tube sheet, and inthe tire box, it was possible to determine the draft effort expended in drawing combustion ^^ases and air through thedifferent sections of the boiler. It will be observed that to per cent of th-j draft effort was required to drawthe gases under the diaphragm; from to per centof the draft was expended in drawing the gases through thetubes, and from to per cent of the draft effort wasrequired to draw the air through the tire bed. The fuel used in these tests was fairly uniform in quality, ^^_22S/ra^M_ ^ 9t^a ?—?— ~& ~?
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
