Part IV.] R. S. Pearson: Antiseptic Treatment of Timber. 91 
Engineers at Berwick-on-Tweed. The sleepers treated consisted of 
50 metre-gange sleepers and 46 broad gauge sleepers, 3 broad gauge 
sleepers in addition having been treated after having been cut in half for 
preliminary experiments. These initial tests with the six half-sized 
broad gauge sleepers gave the following results :— 
TABLE XXX. 
No. of 
■specimen. 
Weight 
before 
treatment, 
in lbs. 
Weight 
after 
treatment, 
in lbs. 
Differ¬ 
ence in. 
weight, 
in lbs. 
Absorp¬ 
tion per 
cubic 
foot, in 
lbs. 
Pressure 
in lbs. 
per sq. 
inch. 
Duration 
of treat¬ 
ment, in 
minutes. 
Remarks. 
A 1 
99-5 
108 
9-5 
5-8 
100 
30 "y 
A 2 
94-5 
105-5 
11 
6-7 
100 
30 1 
Hardly 
B 1 
99-5 
109-5 
10 
6-1 
125 
30 f 
sufficient. 
B 2 
95 
106 
11 
6-7 
125 
30 J 
C 1 
86 
98-5 
‘ 12-5 
7-6 
150 
30) 
Qii (Yi f 
C 2 
87 
101-5 
14-5 
8-8 
150 
30 j 
oumciG-iu. 
The above trial lot having been treated, in order to ascertain the lines 
on which the rest should be treated, the other sleepers, referred to above, 
were all treated at 150 lbs. pressure for 3 hours with the following re¬ 
sults :— 
TABLE XXXI. 
No. of sleepers 
treated. 
Total weight 
before treat¬ 
ment. 
Total weight 
after treat¬ 
ment. 
Difference 
in weight, 
in lbs. 
1 
Absorp¬ 
tion per 
cubic foot, 
in lbs. 
Remarks. 
60 M. G. sleep¬ 
Tons. cwt. qrs. 
1 18 3 
Tons. cwt. qrs. 
2 3 3 
560 
7-5 
Sufficient. 
ers. 
46 B. G. sleep¬ 
4 2 0 
4 10 3 
980 
6-8 
It would be 
ers. 
1 
| 
1 
well to keep 
the figure 
well over 
7 lbs. per 
c. ft. by 
prol o n g i n g 
the period to 
4 hours. 
The firm, in their report, state that they split one large and one small 
sleeper through the middle and found the results satisfactory, creosote 
being traced right through the sleepers. They also had a portion of 
the timber taken from the centre of one of the half sleepers analysed 
and found it contained creosote. From these experiments it is clear 
that this species of timber presents no difficulty in treatment. 
[ Ml ] 
