Suction gas plants . rbons of the coal arenot only retained in the power gas, but their quantity increasedby the decomposition of the tar. APPENDIX IV. METHOD OF DETECTING THE PEESENCE OF CARBONMONOXIDE IN GAS ENGINE EXHAUST. As the efficiency of a gas engine depends largely on theexplosive mixture, it is a veryimportant matter to obtain thecorrect proportion of air. If carbon monoxide be presentin the exhaust, it is a sure proofthat complete combustion has notbeen realised, and, consequently,that the air supply is insufficient. Mr R. E. Mathot, during thediscussion on a recent paper, de-scrib
Suction gas plants . rbons of the coal arenot only retained in the power gas, but their quantity increasedby the decomposition of the tar. APPENDIX IV. METHOD OF DETECTING THE PEESENCE OF CARBONMONOXIDE IN GAS ENGINE EXHAUST. As the efficiency of a gas engine depends largely on theexplosive mixture, it is a veryimportant matter to obtain thecorrect proportion of air. If carbon monoxide be presentin the exhaust, it is a sure proofthat complete combustion has notbeen realised, and, consequently,that the air supply is insufficient. Mr R. E. Mathot, during thediscussion on a recent paper, de-scribed a simple yet very effectivemethod of detecting the presenceof carbon monoxide in the exhaust. A small flask, about 2 ins. indiameter and 4 ins. high, is chosenand fitted with a cork, throughwhich pass two tubes, one of whichdips into about 1 inch of mercurycontained in the bottom of theflask. This latter tube B is con-nected with the exhaust, so thatat each stroke exhaust gases willbe blown into the flask. The 191. Fig. 55.—Apparatus to determineif more than 1 per cent. COis in exhaust gas. 192 SUCTION GAS PLANTS. mercury acts as a check valve to prevent the withdrawalagain of the gases on the suction stroke. The presence ofcarbon monoxide is detected by means of a piece of blotting-paper dipped five or six times in a solution of double chloride ofpalladium and sodium, of such strength as to give a dark browncolour. The blotting-paper is dried after each immersion, andfinally hung within the flask. If more than 1 per cent, of carbon monoxide be present, thepaper will lose its brown colour and become grey. Carbon-Monoxide Poisoning.—The above test is made todetermine whether the combustion in the engine cylinder iscomplete. It must be understood that the presence of carbonmonoxide is dangerous to human health and life. Dr J. S. Haldanehas made a very complete study of the toxic action of this gas,and gives the following data. When 005 CO is present, a manwill feel giddine
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