The analysis of fuel, gas, water, and lubricants . lphide weight of lead acetate is not distinctly darker than aindicator, second paper freshly moistened with the same solu-tion after the first paper has been exposed to the gas for oneminute in an apparatus of approved form through which the gasis flowing at the rate of approximately 5 cu. ft. per hour, the gasnot impinging from a jet upon the test paper. An apparatusfor this test is shown in U. S. Bureau of Standards Circular48, p. 118, and may easily be made with an ordinary 8 in. cyhn-drical gas chimney of about 1% in. in diameter with stop
The analysis of fuel, gas, water, and lubricants . lphide weight of lead acetate is not distinctly darker than aindicator, second paper freshly moistened with the same solu-tion after the first paper has been exposed to the gas for oneminute in an apparatus of approved form through which the gasis flowing at the rate of approximately 5 cu. ft. per hour, the gasnot impinging from a jet upon the test paper. An apparatusfor this test is shown in U. S. Bureau of Standards Circular48, p. 118, and may easily be made with an ordinary 8 in. cyhn-drical gas chimney of about 1% in. in diameter with stoppers ateach end. A 5-ft. burner jet is installed above, and the pillarof an ordinary gas burner below. Arrangements for spreadingthe gas at the intake and a support for the test paper are shownin Fig. 45. A hardened filter paper with smooth surface ispreferred. It should be moist and suspended vertically midwaybetween the watchglass below and the cork above. 1 White, Alfred H., Technical Gas and Fuel Analysis, p. 85, 1920. n FUEL GAS ANALYSIS 195. Oaa lolet Fio. 46.—Junker calorimeter showing details of construction. 196 FUEL, GAS, WATER AND LUBRICATION The total sulphur in gas is determined either by the Refereesapparatus or by the Drehschmidt method. The former isdescribed in the Bm-eau of Standards Circular 48 and isprobably more frequently employed in gas works practice. Thetwo methods are similar, differing chiefly in the mechanismemployed. The Drehschmidt method is made use of in theauthors laboratory and consists of 3 wash bottles connected tothe vacuum system or a water jet pump. The gas is burnedunder a trumpet tube which is connected to the washing trainfor delivering the products of combustion to the alkaline washbottles which have a 5 per cent solution of Na2C03 with a fewdrops of bromine water or a small amount of Na202 added to eachbottle. The burning of 2^ feet of gas is sufficient for a test andthe burner should consume about 1 cu. ft. per hour. The meter,baro
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