. Data on the oxidation of automobile cylinder investigation. Ten-gramsamples were heated to 2500 for one, two, etc., up to seven hours,the insoluble precipitate being thrown down and determined inthe usual way. The results are shown in Table 7 and are plotted in Fig. 2. TABLE 7 Variation in Carbonization with Time of Heating to 250° Oil No. 1 Oil No. 2 Oil No. 3 Per .10 .14 .34 .51 . Per cent .10 .17 .37 .54 . Per cent 0 04 Carbonization in 2 hours .16 Carbonization in 3 hours .30 Carbonization in 4 hours .60 Carbonization in 5 hours Carbonization in 6 ho
. Data on the oxidation of automobile cylinder investigation. Ten-gramsamples were heated to 2500 for one, two, etc., up to seven hours,the insoluble precipitate being thrown down and determined inthe usual way. The results are shown in Table 7 and are plotted in Fig. 2. TABLE 7 Variation in Carbonization with Time of Heating to 250° Oil No. 1 Oil No. 2 Oil No. 3 Per .10 .14 .34 .51 . Per cent .10 .17 .37 .54 . Per cent 0 04 Carbonization in 2 hours .16 Carbonization in 3 hours .30 Carbonization in 4 hours .60 Carbonization in 5 hours Carbonization in 6 hours Carbonization in 7 hours 23 , 30, pp. 932-933; 1906. 14 Technologic Papers of the Bureau of Standards The time was counted from the moment the heating currentwas turned on. About half an hour was required to heat the bathto 2500, but long before this temperature was reached oxidationbegan. All the oils gave practically the same results on heating forone hour, but by the end of two hours oil 3 showed a decided co 15 M *£ J6. Fig. ?The effect, upon the percentage of carbonization, oflengths of time 7hrs. to 2500 for different deviation from the other two. This deviation became increasinglygreater as the period of heating was lengthened, while oils 2 and 3kept close together throughout. The ordinary physical and chem-ical tests gave no indication that the oils would behave so differ-ently on heating. As Kantorowicz says, the slight differences inthe asphalt content of cylinder oils, in contrast with the greatdifferences in practice, would make it appear advisable to testoils quantitatively as to their ability to form new asphalt underdefinite , 37, pp. 1594-1595; 1913- Oxidation of Automobile Oils 15 The curves show that the conditions obtaining at elevated tem-peratures effect a grouping of the oils different from that due tooxidation at ordinary temperatures in sun-light, if we consider only the gains in weightand in acidity. T
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