58 
BULLETIN 1036, TJ. S. DEPARTMENT OE AGRICULTURE. 
Table 18. — Distillation of oil before and after evaporation. 
Creosote 
Creosote 
Temperature 
before 
after 
(degrees C). 
evapo- 
evapo- 
ration. 
ration. 
Per cent. 
Per cent. 
Up to 210. . 
210 to 235... 
2.2 
0.2 
23.3 
0.8 
235 to 270... 
24.1 
14.1 
270 to 315... 
17.5 
32.0 
315 to 355... 
17.1 
27.3 
Residue 
17.5 
25.6 
The actual loss produced by evaporation was 41.5 per cent. The 
loss calculated from the pitch residue was 43.2 per cent. The loss 
calculated from the residue above 270° C. was 41.1 per cent. By 
the pitch-residue method, the maximum difference is 1.7 per cent, 
and the maximum difference by residue above 270° C. is 0.4 per cent. 
As the data used in both cases were the same, these differences are 
due to the method of calculation rather than to any error in analysis. 
In most cases it is impossible to obtain records of any kind that 
will show the composition of the creosote used in the treatment of 
old timbers. Two such records are furnished by the pole lines of 
the American Telephone & Telegraph Co. This company has a 
number of analyses of the original oils used, from which a fair average 
may be obtained. One line, the Washington-Norfolk line, was 
erected in 1897; the other, the Montgomery-New Orleans line, was 
erected in 1899. Five poles in the Washington-Norfolk line were 
removed in 1906 and one in 1908 for analysis. One pole from the 
Montgomery-New Orleans line was removed in 1908 for analysis. 
The analysis of the creosote before treatment was obtained from 
the American Telephone & Telegraph Co., which makes the folio wing- 
report : 
The original reports of the analysis are in our riles and from which we have prepared 
the following table as indicating the average of the oil used in the treatment of the 
poles for that line. It is, of course, impossible to associate the poles under test with 
any particular analysis of oil. 
Table 19. — Average of tests of dead oil of coal tar used in treating poles. 
DISTILLATES. 
Per cent. 
Loss, water, etc. , 170° C 1 
170° to 205° 2 
205° to 210° 4 
210° to 235° 45 
235° to 240° 7 
240° to 270° 16 
270° to 316° 9 
Residue above 316° 16 
100 
Twenty-eight analyses were available for the above average. 
