The analysis and grading of creosotes . rison between indices of refraction of distillations with Hempel flask and with common flask. to f,OS 0^ / / / r^ .^ / .oV ^ y^ ^ t^^ y <^ /.^J o 0^ /.^/ hOO 200 210° 220 230 24^ 250 260 210 280 290 300TEMPERATURE Fig. 19.—Comparison between specific gravities of distillations with Hempel flask and with common flask. ally. The range of indices of refraction with the new bulb is shownin figure 20. [Cir. 112] 33 Too few determinations of the speciiic gravities of pure creosoteshave been made to furnish data for a range, but the vahies for thec
The analysis and grading of creosotes . rison between indices of refraction of distillations with Hempel flask and with common flask. to f,OS 0^ / / / r^ .^ / .oV ^ y^ ^ t^^ y <^ /.^J o 0^ /.^/ hOO 200 210° 220 230 24^ 250 260 210 280 290 300TEMPERATURE Fig. 19.—Comparison between specific gravities of distillations with Hempel flask and with common flask. ally. The range of indices of refraction with the new bulb is shownin figure 20. [Cir. 112] 33 Too few determinations of the speciiic gravities of pure creosoteshave been made to furnish data for a range, but the vahies for thecreosote which gave the lowest results when distilled from a com-mon flask are shown in figure 21. CONCLUSIONS. From the experience of the Forest Service in the analysis ofoils, the results of a portion of which have been detailed above andin Circular 80, it seems desirable that there should be two methodsof analyzing creosote. One, which may be called a field method,very similar to the present method of the Wood Preservers Asso- 16^. rs&- 220 230 2^Cr 250 260 270 2Q(T 290^ 300 3/0TEMPERATURE Fig. 20.—Range of indices of refraction of pure coal-tar creosotes distilled from Hempel bulb. ciation, is to show the general character of the oil under analysis;the other, which may be called a laboratory method, is adapted tothe analysis of an oil which for any reason requires careful ex-amination. This latter more exact method would be useful in an-alyzing oils to be used in the experimental treatments conducted bythe Forest Service and in commercial work where a large amountof creosote is being purchased, or where the delivery of an oil notup to specifications is suspected. FIELD METHOD OF ANALYSIS. The field method of analysis includes two determinations—thespecific gravity of the oil and a fractional distillation. [Cir. 112] 34 SPECIFIC GRAVITY, The perfectly liquefied oil is poured into a hydrometer cylinder,and, at a temperature of 60°, the specific gravity is read with ahy
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