The analysis and grading of creosotes . Per cent. Percent. Percent. 210 210-235 ! 235-245 i , 1 255-265 265-275 275-285 Duplicates. 285-300 300^320 Residue. Table 2 shows that in the case of this oil the loss is almost entirelyin the part distilling below 235°. In figure 2, distillation curves ofanother oil are given, before and after open-tank treatments of chest-nut telephone poles. These distillations were made with the specialflask described on page 30, by means of which a better fract
The analysis and grading of creosotes . Per cent. Percent. Percent. 210 210-235 ! 235-245 i , 1 255-265 265-275 275-285 Duplicates. 285-300 300^320 Residue. Table 2 shows that in the case of this oil the loss is almost entirelyin the part distilling below 235°. In figure 2, distillation curves ofanother oil are given, before and after open-tank treatments of chest-nut telephone poles. These distillations were made with the specialflask described on page 30, by means of which a better fractionationis effected. Laboratory tests of volatility were made on a number of cubic centimeters of each melted oil were measured into taredglass crystallizing dishes 67 mm. in diameter. After the oil hadcooled each dish with its contents was weighed and then kept for fourhours at a temperature of 98°. Then they were cooled and weighedagain, and the percentage losses calculated. These are shown inTable 3. [Cir. 112] 11. 170 /60 /SO-ZOO Z/O ZZO ZJO Z40° 2S0 Z60 Z70 Z80 Z30 300 3/0 3Z0 TEMPERATUREFig. 2,—Distillations of creosote 80 before use in open-tank treatment, and the same creosote (No. 81) after use. Table 3.—Comparative volatilities of creosotes at 58*. Temperature Temperature at which at which Creosote Loss. same loss Creosote Loss. same loss No. will be se- No. will be se- cured during cured during distillation. distillation. Per cent. Degrees. Per cent. Degrees. 13 260 41 245-250 14 235-240 42 230-235 15 235-240 43 255-260 40 240-250 46 240-245 [CIr. 112] 12 The distillation curves of several of these oils are given in Circu-lar 80; No. 13 on pages 13 and 21, 14 on page 22, 15 on page 23, 41on page 26, and 42 on page 27. No. 46 is the oil before use in theopen-tank treatments mentioned on page 8 of this circular, andshown in figure 1. No. 40 is shown in figure 6, and 43 in figure 3, ofthis circular. ss 1 ,,&g
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