Bulletin of the of Agriculture . ure, 80 pounds per square inch; temperature of preservative,180° F. hours to four hours to obtain the same absorption as when thecreosote unmixed with tar was used. A reduction in the average11917°—18—Bull. 607 3 16 BULLETIN 607, U. S. DEPARTMENT OF AGRICULTURE. longitudinal penetration of about 17 per cent resulted from theincrease in the proportion of tar. When the mixture containing 33 J per cent of tar was used, it wasnoted that after the specimens had been treated for a certain lengthof time (see Table 15, footnote) no increase in the absorpt
Bulletin of the of Agriculture . ure, 80 pounds per square inch; temperature of preservative,180° F. hours to four hours to obtain the same absorption as when thecreosote unmixed with tar was used. A reduction in the average11917°—18—Bull. 607 3 16 BULLETIN 607, U. S. DEPARTMENT OF AGRICULTURE. longitudinal penetration of about 17 per cent resulted from theincrease in the proportion of tar. When the mixture containing 33 J per cent of tar was used, it wasnoted that after the specimens had been treated for a certain lengthof time (see Table 15, footnote) no increase in the absorption wasobtained. Hence it was not possible in this test (where the tem-perature of the preservative was 160° F. and the pressure 80 poundsper square inch) to obtain an absorption with the mixture equal tothat obtained with the creosote, even when the time of treatmentwas increased to eight hours*. The average longitudinal penetrationwas about 33 per cent less than obtained with the creosote. PENETRANCE TESTS.(Data in Tables 16 and 17.). • CREO. TAR * IT W«S NOT POSSIBLE TO OBTAIN THI PEOUIP5DABSORPTION WITH THIS MIXTURE AS A FURTHERINCREASE IN THE TIME OF TREATMENT DID HOTINCREASE THE ABSORPTION TIME OF TREATMENT VARIED
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
