. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . 4 is used to guard againstdraughts of air which greatly disturb the flame. 5. The filter connects above with an inverted bottle containinga piece of white filter paper. Blackening of this paper wouldindicate that soot had been drawn through the glass wool andhad been lost. 6. The gas meter used renders it possible to control the rate ofair flow, as it is important that the rate be insufficient to promotecombustion, but sufficiently rapid to draw the soot away fromthe flame. 7. Sucti
. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . 4 is used to guard againstdraughts of air which greatly disturb the flame. 5. The filter connects above with an inverted bottle containinga piece of white filter paper. Blackening of this paper wouldindicate that soot had been drawn through the glass wool andhad been lost. 6. The gas meter used renders it possible to control the rate ofair flow, as it is important that the rate be insufficient to promotecombustion, but sufficiently rapid to draw the soot away fromthe flame. 7. Suction pump. Any convenient form of suction pump ofsufficient capacity may answer. A large Richards pump wasused in the experiments described. 8. The Drying Oven. A brass cylinder RS, 22 cm. long andhaving a diameter of 10 cm. is closed permanently at the end Rand at the other end by a brass plate bolted to a flange as dried by two calcium chloride jars is drawn by way of thebrass T tube C into the oven and passes through the glass filterheld in place as shown. A thermometer T is placed in the 718 Original Communications: Eighth International [vol. A suction pump (not shown) is connected with the narrow stemof the filter at W. Process of Determination The burning of the lamp is continued for 1 hour, which meansthe consumption of 5-8 gm. of oil in most cases. The filter isdried in the oven at 130° C. for 1 hour. It is then cooled andleft in an exsiccator for \ hour. It is then weighed and placed inposition. A current of air at the rate of 200 liters per hour isdrawn up through the filter and measured by the gas meter, thegas meter being run by suction. The filter is replaced in theoven and heated for 1 hour to 130°, when it is cooled in an exsicca-tor and weighted. Refined vegetable and animal oils yield much the same amountsof soot, often less than of the oil consumed. Petroleum oils yield more than and sometimes as muchas 1% or more of soot, as dete
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