. Bulletin . NS Two or three trials may be necessary before mixtures which con-tain unlniown and large proportions of methane can be handled tothe best advantage. The apparatus is accurate to about or cent, but good results can be obtained only by the strictest atten-tion to details. Keep solutions fresh, see that the rubber tubing isin good condition and free from leaks, and lubricate all stopcockswell. Xever draw the solutions in pipettes «, 5, and c into the capil-lary train above the stopcocks; otherwise the analysis may be worth-less. Carbon monoxide is absent from normal mine
. Bulletin . NS Two or three trials may be necessary before mixtures which con-tain unlniown and large proportions of methane can be handled tothe best advantage. The apparatus is accurate to about or cent, but good results can be obtained only by the strictest atten-tion to details. Keep solutions fresh, see that the rubber tubing isin good condition and free from leaks, and lubricate all stopcockswell. Xever draw the solutions in pipettes «, 5, and c into the capil-lary train above the stopcocks; otherwise the analysis may be worth-less. Carbon monoxide is absent from normal mine air and air typify-ing mine conditions other than those caused by fires, explosion, orafter blasting; consequently, pipette c need not be used in analyzingmany samples of mine air. Rubber bags are provided which are fastened to the reservoirbulbs of the pipettes «, ^, and c. These bags should not be removed,and should be examined frequently in order to make sure that the 40 SAMPLING AND EXAMINATION OF GASES. FiGDRB 10.—Copper oxide apparatus for complete analysis of gases. For explanation, see text ANALYSIS OF MINE ATMOSPHERES 41 rubber stoppers are tightly in place and that the bulbs do notleak at anj- point. It will be found advisable occasionally to run some of the acidified-water from burette e through the horizontal capillary train andout through i to neutralize any caustic potash that may have acci-dentally found its way from pipettes a and 5 into the train. COPPER OXIDE APPARATUS FOB COMPLETE ANALYSIS OF GASES The Haldane apparatus previously described is intended for usein analyzing gas mixtures that do not contain large enough pro-joortions of any constituents to cause the mercury to rise, duringan analysis, to the ungraduated part of the burette where readingscan not be made. The authors have foimd that an apparatus of the type shown inPlate III can be used for the analysis of many normal or abnormalmine atmospheres. However, many samples containing large pro-port
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