The art of anaesthesia . 204 time is put into each of two aluminum retorts (a double sys-tem is used so that the plant will not be completely dis-abled in case of accident). This is heated to 400 ammonium nitrate then breaks down into N20 andH20, which mixture is cooled by a condensing coil andlead into wash bottles containing potassium permanganate. •IHlr M> t*!„ lMjs n Of .]!_L ??? PLACE >J ^toMTS CAUf/Ok [D^^m\ //J! EN CLOSING Wf ? I umwimiM lm#%M/ /.noriRMLYUIffltM fc> UNf E^Orr.* / SERIAL ^/J Qta , r » v A . mntk w Fig. 97.—Label on N;0 cj-linder. This tre
The art of anaesthesia . 204 time is put into each of two aluminum retorts (a double sys-tem is used so that the plant will not be completely dis-abled in case of accident). This is heated to 400 ammonium nitrate then breaks down into N20 andH20, which mixture is cooled by a condensing coil andlead into wash bottles containing potassium permanganate. •IHlr M> t*!„ lMjs n Of .]!_L ??? PLACE >J ^toMTS CAUf/Ok [D^^m\ //J! EN CLOSING Wf ? I umwimiM lm#%M/ /.noriRMLYUIffltM fc> UNf E^Orr.* / SERIAL ^/J Qta , r » v A . mntk w Fig. 97.—Label on N;0 cj-linder. This treatment removes the oxides. The gas is then fedinto the bottom of so-called towers filled with coke. Fromthe roof of these towers sodium hydrate is constantlysprayed. This treatment removes any HN03 which maybe present. From the top of the tower the gas is conveyedonce more to wash bottles containing sulphuric acid. Thistreatment removes any free alkali. The gas is then washed. 206 ANESTHESIA by passing through fresh water and finally led to an ordi-nary gasometer. When a sufficient bulk of gas has herecollected it is compressed by a pump either to liquefaction(for storage in small cylinders at a pressure of 1500 the square inch), or for storage in large tanks at a com-paratively low pressure, about 100 lbs., which is again re-duced to about five pounds when it is piped to the operat-ing room to be used as desired. When the gas reaches theoperating room it passes through a gas meter which checksthe amount consumed. From the meter it is conveyedthrough heavy rubber tubing to the apparatus which regu-lates the immediate flow to the face piece. The cost of the N^O is about two cents a gallon. Whensupplied in the cylinders it costs a little more;when in 250-gallon cylinders or larger the cost is somewhatless. The actual cost of manufacturing the gas is smallonce a satisfactory plant is established. When buying the gas in small quantities, most
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanesthe, bookyear1919
