. The Street railway journal . ombustion of thefuel, can serve as a criterion of the performance and effi-ciency of the boiler plant and as a means of detectingdefects and suggesting improvements in operation. To make clear the operation of these recorders, presented the accompanying diagram and descrip-tion of the Orsat apparatus, which is the oldest form usedfor making chemical analyses of flue gases. The movable vessel E, of glass, containing water, is con-nected by a flexible (rubber) tube, F, with a stationaryvessel, GD, of glass, of the general form shown, havinggraduations a
. The Street railway journal . ombustion of thefuel, can serve as a criterion of the performance and effi-ciency of the boiler plant and as a means of detectingdefects and suggesting improvements in operation. To make clear the operation of these recorders, presented the accompanying diagram and descrip-tion of the Orsat apparatus, which is the oldest form usedfor making chemical analyses of flue gases. The movable vessel E, of glass, containing water, is con-nected by a flexible (rubber) tube, F, with a stationaryvessel, GD, of glass, of the general form shown, havinggraduations at the upper part of the tubular portion, G,and connecting by a small tube, C, with a three-way coup-ling in which are valves or stop-cocks, B, L and M. Thecock L controls a connection leading to a receiving vesselH, filled with small glass tubes, and connected at the bot-tom by a bent tube with a supplemental receiver, /, opento the atmosphere at the top. The liquid put in the vessels STREET RAILWAY JOURNAL. [Vol. XXX. No. THE ORSAT C02 RECORDER H and / depends on the particular gas to be the apparatus is to be used for determining the per-centage (by volume) of C02 in flue gases, the liquid putin these vessels consists of a solution of caustic soda, orcaustic potash. The process of making an analysis com-prises various manipulations which must be made inproper order, with a certain care, each requiring a certaintime. The cocks M and L being both closed, the cock Bis opened, leaving a free passage from the receiver D tothe atmosphere. The movable vessel E is then raised,causing the level of the liquid to rise in the vessel G andthe liquid to fill the portion D as far as the small tube cock B is then closed and the cock M, controlling theconnection with the supply of gas, is opened, allowing thegas which is to beanalyzed to enter. Thevessel E is now lowered,and the gas enters andfills the vessel D and apart of the vessel G asfar as desired. The exactquan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
