. Bulletin . ^?tub, Ten l-mm. holes T. FiGCEB 17.—Blower for combustion pipette OXYGEN Pass the gas into the pyrogallate pipette r six times for low oxygencontent and fresh reagent, and twelve times for high-oxygen the volume does not remain constant after 12 passes, the solu-tion should be renewed. contraction X100 Percentage of oxygen= c. c. of sample taken CARBON MONOXIDE AND HYDROGEN Turn stopcocks j, k^ and n to establish communication betweenthe burette and combustion pij)ette t through the copper oxide tubei; lower the furnace I over the copper oxide tube and adjust therheostat
. Bulletin . ^?tub, Ten l-mm. holes T. FiGCEB 17.—Blower for combustion pipette OXYGEN Pass the gas into the pyrogallate pipette r six times for low oxygencontent and fresh reagent, and twelve times for high-oxygen the volume does not remain constant after 12 passes, the solu-tion should be renewed. contraction X100 Percentage of oxygen= c. c. of sample taken CARBON MONOXIDE AND HYDROGEN Turn stopcocks j, k^ and n to establish communication betweenthe burette and combustion pij)ette t through the copper oxide tubei; lower the furnace I over the copper oxide tube and adjust therheostat to give a temperature of 290° to 310° C; pass the gasslowly (10 c. c. per minute) through the copper oxide tube intopipette t and back again into the burette at the same rate; repeat. Raise the furnace and cool the copper oxide tube by directing astream of compressed air from a blower tube, shown in Figure 17. ANALYSIS OF MINE ATMOSPHERES 51 This tube consists of a piece of glass tubing closed at the end and bentinto a one-turn c
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