Bulletin of the of Agriculture . ffect of varying (1) time of treatment and (2) pressure in order to secure approxi-mately the same absorption in longleaf pine using mixtures of tar No. 4 and creosote No. 6. With timevaried the treating temperature was 160° F. and the pressure 80 pounds per square inch. With pressurevaried the time of treatment was 2 hours and the temperature 160° F. i Time of treatment and temperature of preservative constant and pres-sure varied.—(Tables 16 and 17 and fig. 8.) The specimens used in these tests were matched with those just pre-ceding, and hence
Bulletin of the of Agriculture . ffect of varying (1) time of treatment and (2) pressure in order to secure approxi-mately the same absorption in longleaf pine using mixtures of tar No. 4 and creosote No. 6. With timevaried the treating temperature was 160° F. and the pressure 80 pounds per square inch. With pressurevaried the time of treatment was 2 hours and the temperature 160° F. i Time of treatment and temperature of preservative constant and pres-sure varied.—(Tables 16 and 17 and fig. 8.) The specimens used in these tests were matched with those just pre-ceding, and hence the results are directly comparable. The pressurerequired to obtain a given absorption in the test in which the tempera-ture of the preservative and the time were constant was approximatelyproportional to the amount of the tar in the mixture. With almost thesame absorption of preservative the penetrations of the two tar andcreosote mixtures were from 27 to 29 per cent less than those obtained Bui. 607. U. S. Dept. of Agriculture Plate Penetrance Specimens. Specimens arranged in order of treatment as given in Table 16. Group No. 1 treated with of treatment, 2 hours; pressure, 75 pounds per square inch; temperature, 180° F. GroupNo. 2 treated with 80 per cent creosote, 20 per cent tar. Time of treatment varied; temperature,180° F. Group No. 3 treated with 6(i| per cent creosote, 33J per cent tar. Time of treatment varied;temperature, 180° F. Group No. 4 treated with 80 per cent creosote, 20 per cent tar. Pressurevaried; temperature, 180° F. Group No. 5 treated with 66§ per cent creosote, 33$ per cent varied; temperature, 180° F. Bui. 607, U. S. Dept. of Agriculture. Plate X. /?-.•.
Size: 1681px × 1487px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
