. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . cessary thatthe mixture issue from the burner at afairly rapid rate. Otherwise, the speedof flame transmission may be greater thanthe rate of forward movement of the mix-ture. In this case, the flame would enter iir tank. u^Hiiin).; the cause of mixing is one of the most importantfunctions of the torch. Upon the thor-oughness of the mixing depends theeconomy of oxygen consumption. Let meexplain. The oxy-acetylene process de-pends upon limiting the combustion of thecarbon, derived f
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . cessary thatthe mixture issue from the burner at afairly rapid rate. Otherwise, the speedof flame transmission may be greater thanthe rate of forward movement of the mix-ture. In this case, the flame would enter iir tank. u^Hiiin).; the cause of mixing is one of the most importantfunctions of the torch. Upon the thor-oughness of the mixing depends theeconomy of oxygen consumption. Let meexplain. The oxy-acetylene process de-pends upon limiting the combustion of thecarbon, derived from the explosion ofthe acetylene, to carbon monoxide. In or-der to get this result, and thus avoid com-bustion to carbon dioxide, the supply ofoxygen is limited. The proper amount re-quired is exactly the same as the volumeof acetylene. .Any oxygen over and atK)\4is really not wanted. This is be the state of afTairs. The reader maynow ask. Why then is a greater amountof oxygen supplied than of acetylene?The reason appears to be just this: Anexcess of is necessary in order to. Tnrr^ae^ mm4 S»I4»^ OKTAii i- or .\.^.^K^^il.^ ok torch. view of economical consumption of oxy-gen. The matter of the performance of atorch may be tested in the following man-ner : Let standard work be carried on—that is, work requiring a neutral adjust-ment of the flame, which neutral condi-tion corresponds to a sharply outlined sin-gle inner flame of brilliant white. Suchwork is, in general, that which consists ofrolled or cast steel, iron or nickel. Theconsumption of both gases is to be notedby means of the indicator. The longerthe period, or the sum of the divisions ifthe period, the better the final result. Therelative amounts of oxygen and acetylenewill show whether the torch is operatingto high advantage. Oxygen will ordinarily be bought andnot made on the spot. It will come in the burner. This requirement that shall issue under considerablepressur
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