!Part IV.] R. S. Pearson: Antiseptic Treatment of Timber. 117 
TABLE XXXVIII. 
Estimated cost of treating sleepers based on the experiments described in 
Chapters III and IV, exclusive of cost of extraction and of Royalty 
on the timber. 
v 
Species. 
Locality from 
whence procured. 
' Foivellized A venarius 
sleepers, j Carboh - 
F neurn 
1 1 
Chloride 
of Zinc and 
Green oil. 
| Solign tm 
1 and Lir c?u 
J Fuel oil. 
Rs. A. P. 
Rs. A. P. 
Rs. A. P. 
Rs. A. p. 
.. Pinus long - 
Chakrata Division, 
110 
j 0 12 4 
114 
| 1 5 0 
ifolia. 
United Provinces. 
per B. G. 
1 per P. G. 
per B. G. 
; per B. G. 
sleeper. 
1 sleeper. 
sleeper. 
sleeper. 
..Pinus exeelsa 
Ditto 
Do. 
j Do. 
Do. 
Dipterocarpus \ 
Pyinmana Division, | 
13 0 
0 7 3 
0 9 0 
0 14 10 
tuberculatus. 
Upper Burma. 
per B. G. 
per M. G. 
per M. G. 
per M. G. 
sleeper. 
sleeper. 
sleeper. 
sleeper. 
Dipterocarpus 
Ditto 
Do. 
Do. 
Do. 
Do. 
alatus. 
T erminidia 
North'Kanara, Bom- j 
12 3 
0 9 5 
10 2 
13 8 
tomentosa. 
bay ; those treated 
with Chloride of 
Zinc and Green oil, 
per B. G. 
per M. G. 
per B. G. i 
1 per B. G. 
1 
sleeper. 
sleeper. 
sleeper ! 
1 
sleeper. 
from Betul Divi- j 
sion, Central Pro¬ 
1 
f 
1 
vinces. 
1 
1 
Remark . 
49 per cent. 
Solignum and 
60 per cent. 
Liquid Fuel oil. 
33 per cent. 
Solignum and 
6/ per cent. 
Liquid Fuel oil. 
Ditto 
From the above table it will be seen that the cost of treating broad 
gauge sleepers by the Powell process varied between Re. 1-1-0 to Re. 1-3-0. 
The treatment of broad gauge sleepers with Avenarius Carbolineum, 
.as carried out in these experiments, was extremely cheap, in spite of the 
oil costing as much as Re. 1-12-0 per gallon. The cost of treating broad 
gauge sleepers with Chloride of Zinc and Green oil varied between Re. 1-0-2 
and Re. 1-1-4. This is, in practice, probably the cheapest method of 
all by which timber can be treated; for, though the figures given in the 
accompanying table do not substantiate this assertion, the amount of 
antiseptic introduced into the timber under these experiments was in 
-considerable excess of that in all the other experiments. The cost of 
treating broad guage sleepers with a mixture of Solignum and Green 
oil was relatively .high, in spite of the proportion of the more expensive 
oil being reduced to 33 per cent., the reason being obviously the high 
■cost of Solignum . On the other hand, were a good grade of Creosote 
to be substituted for this oil and mixed with a cheap Petroleum oil, 
the cost of treatment could be considerably reduced. This procedure has 
been adopted in treating the United Provinces ‘ Chir 5 sleepers though, 
in this instance, the amount of oil to be absorbed per sleeper has been 
raised to 15 lbs., involving a corresponding rise in the cost of treatment. 
From experience gained in recent years, it is thought that any treatment 
which involves a maximum cost of more than Re. 1-4-0 to Re. 1-6-0 per 
[ 247 ] 
