110 
Indian Forest Records. 
[Vol. VI 
treating timber : the suitability or otherwise of the oil is dependent 
on its composition. Some creosotes contain more tar acids than others, 
while others contain an excess of cresolic and phenolic substances which, 
though of a highly antiseptic nature, are too volatile to be used in the 
treatment of railway sleepers. Thus not more than 8 per cent, of tar 
acid should be present, while the oil used should commence to boil at 
about 205°C. and contain a predominance of Napthaline oils, boiling up 
to 250°C. and the remaining Anthracene oils boiling up to 360°C. and 
over. 
Various specifications have been laid down by Experts, Railway 
Companies and Timber Treating Associations from time to time, a few 
of which, together with the analyses of the oils used in the experiments 
described in the previous chapters, are given below, which may help 
interested persons in their choice of a suitable oil :— 
TABLE XXXVII. 
Analysis carried 
OUT by Dr. 
Frank. 
By Mr. Puran Singh, Chemical Adviser, 
search Institute. 
Forest Be- 
Name of Antiseptic. 
Green oil. 
Avenarius 
Carbolineum 
Solignum. 
Liquid Fuel. 
l 
1 
Avenarius 
Carbolineum 
and Liquid 
Fuel oils 
mixed in 
equal pro¬ 
portions. 
Specific gravity at 15°C. 
1-096 
1-130 
1-095 
at 30°C.—0-848 
> 
Water . 
, 
a trace only 
1-40 per cent. 
1-10 per cent. 
2-65 per cent. 
1 
1 
| 
not record- 
Solids at 15°C. 
Nil. 
0-92 „ 
0-43 
at 30°C. 0-59 per 
\ 
> ed. 
cent. 
Tar acids 
5 per cent. 
1-51 „ 
3-35 
0-08 per cent. 
l 
No. of drops coming over at 160°C. . 
Nil 
1st drop . 
Nil . 
Nil 
i 
Nil. 
Ditto 
180°C. . 
„ 
Nil . 
1st drop . 
1st drop at 185°C. 
l 
Ditto 
200°C. . 
» 
„ 
(not recorded) 
(not recorded) . 
,, 
Ditto 
210°C. . 
„ 
3rd drop . 
21st drop . 
12th drop 
j 
1st drop- 
1st drop at 221°C. 
Ditto 
230°C. . 
3rd drop . 
7th „ . 
62nd „ . 
29th „ 
3rd „ 
Ditto 
250°C. . 
11th „ . 
17th „ . 
143rd „ 
52nd „ 
16th „ 
Ditto 
270°C. . 
30th „ . 
21st „ . 
218th „ . 
109th „ 
40th „ 
Ditto 
300°C. . 
51st 
48th „ . 
357th „ . 
203rd „ 
125th ,, 
Ditto 
320°C. . 
63rd „ . i 
(not recorded) ( 
(not recorded) 
(not recorded) . 
(not recorded) > 
Ditto 
360°C. . 
88th „ 
Do. 
Do. 
Po, . | 
Do. 
By examining these analyses it will be seen that Green oil , which is 
a commercial Coal-tar creosote, fulfills all the conditions necessary for a 
[ 210 ] 
