. American engineer and railroad journal . tion. If combustion were perfect with just suflBclentair going through the grates to ca\ise complete combustion. with no excess of air present, we would have in the smokeboxgases simply carbon dioxide, nitrogen and moisture. Theanalysis therefore would show carbon dioxide, no carbon mon-oxide and no oxygen. COLLECTION OF SAMPLE OF GAS. For the purpose of collecting a sample of gas for analysiswe used the arrangement shown in Fig. 3. The sampler con-sists of a perforated pipe extending a tew inches into the stackand has a trap attached to it to catch c
. American engineer and railroad journal . tion. If combustion were perfect with just suflBclentair going through the grates to ca\ise complete combustion. with no excess of air present, we would have in the smokeboxgases simply carbon dioxide, nitrogen and moisture. Theanalysis therefore would show carbon dioxide, no carbon mon-oxide and no oxygen. COLLECTION OF SAMPLE OF GAS. For the purpose of collecting a sample of gas for analysiswe used the arrangement shown in Fig. 3. The sampler con-sists of a perforated pipe extending a tew inches into the stackand has a trap attached to it to catch cinders. The bottle inwhich the gas sample is to be collected was filled with a strongsolution of salt to start with and this was syphoned out intoa canon the running board as shown, the gas sample goinginto the bottle to take its place. The sample of gas Is thentaken into the test car behind the engine, where it is brine is syphoned out at such a rate as to let the gassample cover a period of 15 minutes firing. The gas sample. FIG. 4. is also handled under such precautions as to avoid its escapeor mixture with air. METHOD or ANALYSIS. The apparatus used for gas analysis is shown in Fig. 4,which is an Orsat gas apparatus, somewhat modified by andobtained from Mr. A. Bement, gas expert, Chicago. Having obtailied 100 cubic centimeters of the gas sample inthis apparatus the carbon dioxide is first absorbed by a solu-tion of potassium hydrate and its amount determined by re-duction in volume. The oxygen is then determined by ab-sorption in alkaline pyrogallic acid solution in a similar man-ner and carbon monoxide by absorption in cupric chloride so-lution. For further details on method of analysis I refer toboolis on gas analysis. KESULTS OF ANALYSIS FROM BUKNING LIGNITE COAL. Perfect combustion with lignite coal would show about asfollows: CO2, 18 per cent.; CO, 0 per cent.; O, 0 per cent Thiswould be under ideal conditions. With bituminous coal, verygood practical res
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