Bulletin of the of Agriculture . the pressure and time of treatment. PENETRANCE TESTS WITH CREOSOTE NO. 4 AND TAR NOS. 1 AND 5. Time of treatment and pressure constant and temperature varied.— (Tables 18 and 21 and figs. 11 and 12). Two series of tests on the effect of varying the temperature weremade, both on the penetrance apparatus. In the first series a mixtureof 50 per cent creosote No. 4 and 50 per cent tar No. 1 was used. Inthe second, 75 per cent of tar No. 5 and 25 per cent of creosote was used. Both the absorption and penetration were materiallyincreased as the tre
Bulletin of the of Agriculture . the pressure and time of treatment. PENETRANCE TESTS WITH CREOSOTE NO. 4 AND TAR NOS. 1 AND 5. Time of treatment and pressure constant and temperature varied.— (Tables 18 and 21 and figs. 11 and 12). Two series of tests on the effect of varying the temperature weremade, both on the penetrance apparatus. In the first series a mixtureof 50 per cent creosote No. 4 and 50 per cent tar No. 1 was used. Inthe second, 75 per cent of tar No. 5 and 25 per cent of creosote was used. Both the absorption and penetration were materiallyincreased as the treating temperature was increased. The testsindicated that temperature is an important factor in absorption and 1 Absorptions in these cases were about 9 per cent higher than with the creosote. ABSORPTION AND PENETRATION OF COAL TAR AND CREOSOTE. 19 PENETBANCE TESTS.(Data in Table 20.) o 4O *»..___ 2 -*=? 0*— 130 140 150 160 170 160 190 200 210 220 6 o i K |S at b S3 *3 < » -*? 130 140 150 160 170 180 190 200 210 220. 150 160 170 180 190 200 210 223TEMPERATURE-DEGREES FAR. Pig. 11.—The relative absorptions and penetrations into longleaf pine of a mixture of equal parts of creosoteNo. 4 and a normal by-product coke-oven tar No. 1 at different temperatures (normal amount of freecarbon in tar, 6 per cent, by weight). Time of treatment, 2 hours; pressure, 75 pounds per square inch. 20 BULLETIN 607, U. S. DEPARTMENT OF AGRICULTURE. penetration. Thus, in figure 11, the penetration at 210° F. wasabout two and one-half times that at 160° F., while the absorption PENETRANCE TESTS.(Data in Table 21.) 3 8 < Ul a. ojjg « ffi 9SORPTION- <« 1 50 r TO ii 10 1 30 2 so 2 10 2 20 TEMPERATURE—DEGREES FAR. FIG. 12.—The relation between absorptions and penetrations into longleaf pine using a mixture of 25 percent creosote No. 4 and 75 per cent tar No. 5 at different treating temperatures. Time of treatment, 1 hour;pressure, 200 pounds per square inch.
Size: 2333px × 1071px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
