Part IV.] B. S. Pearson: Antiseptic Treatment of Timber. 61 
To ascertain tlie period of immersion necessary to make the sleepers 
take up 5 lbs. of oil each, batches of sleepers were weighed before and 
after immersion, with the following results :— 
TABLE XXI. 
Average 
Species. 
absorption, 
per sleeper, 
of 22 sleep¬ 
Temperature of the 
solution. 
Period of immersion. 
ers. 
Dipterocarpus alatus , metre-gauge 
sleepers. 
Ditto 
lbs. 
2-25 
75°C. dropping to 63° C. . 
2 hours heating and 4 
hours cooling =6 hours. 
41 
75°C. and then allowed to 
2 hours heating and 7 
cool down. 
hours cooling =9 hours. 
Ditto 
3-9 
Ditto . 
2 hours heating and 7£ 
hours cooling=9l 
hours. 
Ditto 
5-4 
Ditto 
2 hours heating and 11 
hours cooling= 13 
hours. 
Ditto 
5-3 
Ditto 
Ditto. 
Ditto 
4-3 
80°C. and then allowed to 
2 hours heating and S 
cool down. 
hours cooling=10 
hours. 
Ditto 
4-6 
Ditto 
Ditto 
Ditto 
3-9 
Ditto 
Ditto 
Average absorption of all but the 1st lot, which was a trial run, i.e., of 154 sleepers in all=4-6 lbs. per 
metre-gauge sleeper. 
The rest of the sleepers of this species were treated with a 12 hours 
immersion period. The Dipterocarpus tuberculatus sleepers were dealt 
with in a similar manner with the following results :— 
TABLE XXII, 
i 
Average 
Species. 
absorption 
per sleeper, 
of 22 sleep¬ 
Temperature of the 
solution. 
Period of immersion. 
ers. 
Dipterocarpus tuberculatus, metre- 
gauge sleepers. 
lbs. 
3-45 
80°C. 
2 hours heating and 9 
hours cooling = 11 
hours. 
Ditto 
4-1 
85°C. 
Ditto 
Ditto 
4-5 
84° C. 
2 hours heating and 9| 
hours cooling=ll| 
hours. 
Ditto 
4-7 
89°C. 
2 hours heating and 10 
hours cooling =12 
hours. 
Ditto 
4-4 
85°C. 
2 hours heating and 12 
hours cooling=14 
hours. 
Ditto 
4-4 
Ditto 
2 hours heating and 13 
hours cooling= 15 
hours. 
Ditto 
6-25 
Ditto 
2 hours heating and 14 
hours cooling=16 
hours. 
Ditto 
61 
Ditto 
Ditto 
Ditto 
5-0 
Ditto 
Ditto 
Ditto 
4-6 
Ditto 
Ditto 
Ditto 
4-25 
Ditto 
Ditto 
Ditto 
5-4 
Ditto 
Ditto 
Average absorption of 132 sleepers treated under a 16-hours’ immersion period—5 - 29 lbs. per metre- 
gauge sleeper. 
[ 191 3 
