Show automobile EXHAUST GAS investigation tests are beiji being continued at the bureau of mines experiment station pittsburgh pa on automobile nobile exhaust gases to devise a method of adjusting adgustin 6 carburetors tors by gas analysis tests have shown that the mileage bears a direct relation to tile the percentage of carbon dioxide in the exhaust gas b as from a motor vehicle A portable carbon dioxide indicator for adjusting au car bure tors on the road by gas g as analysis is being developed connection is made from the exhaust pipe to the indicator by a 1 copper coppe r tube and the indicator is placed either in the front or back seat samples of the exhaust gas are taken while the vehicle is operated on oil the road and analyses made for carbon dioxide without stopping from the percentage of carbon dioxide the carburetor adjustment adjustment is determined which removes all guesswork of adjustment many tests have shown the practicability of the indicator and in most tests it is possible to increase the mileage n at least 25 per cent without decreasing the power or flexibility |