The Bulletin 9 



The distillation test was carried out by the continuous Engler method 

 as modified for the official residue test : 



"A weighed Engler flask, containing 100 cc. of illuminating oil, is pro- 

 tected by a layer of asbestos on the bulb and neck. A thermometer is in- 

 serted in the usual way so that the upper part of the mercury bulb is oppo- 

 site the lower part of the side neck of the flask. The distillation is con- 

 ducted in the regular manner over a Bunsen flame, the heat being regu- 

 lated so as to distill the oil as evenly as possible over a period of approxi- 

 mately 25 minutes. The time of distillation is counted from the time the 

 first drop leaves the condenser until the burner is finally extinguished and 

 removed. The temperature is brought up to the actual corrected tempera- 

 ture of 570 degrees Fahr. a second time after cooling at least 30 degrees 

 Fahr. The corrected temperature is obtained by applying the usual formula 

 lor correction for the exposed part of the thermometer. The total period of 

 heating shall not exceed 45 minutes. The residue in the flask is reported 

 in per cent by weight." 



SAMPLES TESTED. 



Samples taken by inspectors from original containers during the first 

 three months of the year were saved and a composite sample of each 

 brand made. The analyses given were made on these composite samples. 



In several instances where there was a sufficient quantity of oil for the 

 test, only the samples for January and February were used. In sev- 

 eral instances there was only one sample of a brand taken. This was 

 included as it was desired to secure data on as many brands as possible. 



