. Data on the oxidation of automobile cylinder ter 289 hours Acidity after 333 hours Acidity after 419 hours Oil No. 1 Oil No. 2 .08 .08 .09 .10 .19 .21 .16 .24 .17 .25 .38 .51 .50 .71 .86 Oil No. 3 .08 .09 .22 .22 .25 .50 .67 It was found that the percentage of the insoluble oxidationproduct thrown down by petroleum ether is not proportional tothe gain in acidity. The percentages found at the end of theexposure test were , , and , respectively. 7 Cf. Schaal: D. R. Pat. 32705,
. Data on the oxidation of automobile cylinder ter 289 hours Acidity after 333 hours Acidity after 419 hours Oil No. 1 Oil No. 2 .08 .08 .09 .10 .19 .21 .16 .24 .17 .25 .38 .51 .50 .71 .86 Oil No. 3 .08 .09 .22 .22 .25 .50 .67 It was found that the percentage of the insoluble oxidationproduct thrown down by petroleum ether is not proportional tothe gain in acidity. The percentages found at the end of theexposure test were , , and , respectively. 7 Cf. Schaal: D. R. Pat. 32705, , 9, p. 1520, 1885. 8 Technologic Papers of the Bureau of Standards IV. CARBONIZATION OF OILS OXIDIZED IN SUNLIGHT The carbonization values of the oxidized oils were determinedon samples taken at the same times as those used for the determina-tion of acidity. The procedure followed was the same as describedin earlier papers,8 but an electrically heated and controlled air bathwas used instead of one heated by gas. Ten-gram portions of oil,. 100 200 300 400 hrs. Fig. i.—Percentage of carbonization, gain in weight {decigrams) due to oxidation, andacidity (as milligrams of KOH required for neutralization) of oils exposed to sunlightand air contained in 150-cc Brlenmeyer flasks, were heated to 2500 forthree hours, allowed to cool, and diluted with 50 cc of petroleumether. The flasks were then tightly corked and set aside for about24 hours. The precipitate was filtered off in a Gooch crucibleprepared with a disk of filter paper (S. & S. No. 589 blue ribbon) 8 Bull., Bur. Standards, 7, p. 370, 1910- Techn. Paper, Bur. Standards, 4, p. 4, 1911; J. Ind. Eng. Chem.,3, pp. 235, 813, 1911. Oxidation of Automobile Oils 9 covered with a thin layer of asbestos to keep it in place. It waswashed with petroleum ether, dried at 95-1000, and results obtained are included in Table 3 and are shown in Fig. 1. TABLE 3 Carbonization Values of Oils Oxidized in Sunlight Exposure
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