Part II.] 
Pearson : Antiseptic Treatment of Timber. 
59 
Cost of Treatment. 
The cost of treatment must vary with the amount of oil absorbed 
by different species, while the cost of the necessary apparatus, which is 
extremely simple, together with fuel, labour, etc., may be put at 1 anna 
per B. G. sleeper. No figures are available as to the cost of treating 
sleepers in India on a large scale with this antiseptic ; the only data 
available are therefore taken from the experiments made on a laboratory 
scale. Taking the wholesale cost of the oil at Bl-10-0 per gallon, 
if imported on a large scale straight from Europe, and the weight per 
gallon as 11 lbs. 4 oz. (180 oz.), the cost per oz. works out to 0T5 anna. 
A. B. G. sleeper (9*5' X 10" x 5") is approximately 24*4 square feet or 
contains 3 - 3 cubic feet. Taking the percentage of absorption by the 
various timbers as given in the previous table, the cost of treating 
B. G. sleepers of those species works out as follows 
Species.. 
Cost 
of 
processing. 
| 
Cost of oil 
absorbed by 
a B. G. sleeper 
per superficial 
area in sq. ft. 
Cost of oil 
absorbed by a 
B. G. sleeper 
per cub. 
ft. 
Total cost of 
treating a B. G. 
sleeper based 
on superficial 
absorption. 
Total cost of 
treating a 
B. G. sleeper 
based on the 
assumption of 
complete im¬ 
pregnation. 
Boswellia serrata 
anna. 
1 
annas. 
11-8 
annas. 
18*6 
annas. 
12-8 
annas. 
19-6 
Pinus longifolia 
1 
231 
57 *7 
24'1 
58-7 
Pinus ex cels a 
1 
6-6 
16-5 
7-6 
17-5 
Picea Morinda . 
1 
74 
135 
8-1 
14*5 
Abies Pindrow 
1 
6-6 
16-5 
7-6 
17*5 
Pterocar'pus mac- 
1 
4-7 
8*2 
5-7 
9-2 
rocarpus. 
7-1 
Bombax malabari- 
1 
12*3 
8-1 
13-3 
cum. 
Bauhinia retusa . 
1 
4-7 
8-2 
5-7 
9-3 
Dipterocar'pus tn- 
1 
24 
45 
3'4 
5*5 
berculatus. 
Anogeissus lati- 
.1 
6-6 
16-5 
7-6 
17*5 
folia. 
Shorea robust a 
1 
2-4 
4’5 
3-4 
5*5 
Average 
1 
755 
16-09 
8-55 
17-09 
( 132 ) 
