58 
Indian Forest Records. 
tv<>L. vi 
The number of sleepers banded over to the Railways, after treatment, 
was 249 broad gauge Finus longifolia sleepers, 100 broad gauge Finns 
excelsa sleepers, 460 broad gauge Terminalia tomentosa sleepers, 470 
metre-gauge Dipterocarpus tuberculatus sleepers, and 500 metre-gauge 
Dipterocarpus alatus sleepers, in all 1,779 sleepers. 
(ii) Method of treatment with Solignum and Liquid Fuel. 
{a) Treatment of Pinus longifolia and P. excelsa broad gauge sleepers 
and a special batch of Cedrus Deodara broo^d gauge sleepers. 
The aim of tbis experiment was to treat Fine sleepers in a mixture of 
40 per cent. Solignum and 60 per cent, of Earth oil. Tbe amount of oil 
it was proposed to introduce into each sleeper was 9 lbs., tbougb, owing 
to some of tbe sleepers having seasoned in tbe yard a year longer tban 
others, it was found difficult to keep tbe absorption constant. Tbis 
difference was further accentuated by tbe presence of much sap-wood 
in some sleepers and little or none in others, necessitating their classifica¬ 
tion into two separate lots, and subjection to slightly different treatment. 
A slight modification was made in tbe case of these experiments to 
tbe usual procedure followed in previous years, by treating 50 Cedrus 
Deodara sleepers, at tbe special request of the Railway Authorities, these 
sleepers being supplied free of cost. 
In order to fix the immersion period for Pinus longifolia sleepers, the 
following tests were carried out:— 
TABLE XVIII. 
Species. 
Average 
absorption, 
1 per sleeper, 
of 17 
sleepers. 
Temperature of Solignum 
and Liquid Fuel. 
1 
1 
Period of immersion. 
| 
Pinus longifolia, 4 weeks out of 
the floating stream, converted 
one year before treatment. 
lbs. 
8-0 
6- 5 
6-8 
7- 2 
8- 2 
8-5 
80°C. dropping to 55°C. 
81°C. „ 60° C. 
79°C. „ 68° C. 
80°C. „ 63°C. 
88° C. „ 66°C. 
93°C. „ 73°C. 
6 hours. 
4 „ 
5 „ 
6 „ 
6 „ 
6 „ 
Average of 102 broad gauge 
= 7-5 
sleepers. 
Pinus longifolia, 8 to 12 months 
18-2 
72°C. 
56°C. 
5 „ 
out of the floating stream, con¬ 
27-7 
70°C. 
60° C. 
4 „ 
verted two years before treat¬ 
20*2 
59°C. 
57°C. 
2 
ment. 
8-7 
62°C. 
50°C. 
H „ 
10-7 
59°C. 
50°C. 
H „ 
6-8 
! 
48°C. 
48° C. 
20 minutes. 
Average of 102 broad gauge 
= 15-4 
sleepers. 
[ 188 ] 
