Part I.] Pearson: Antiseptic treatment of Sleepers. 
11 
{iv) Powellized ‘ Kanyin.’ 
‘ Kanyin ’ Dipterocarpus alatus, Powellized sleepers. The ‘ Kanyin ’ 
sleepers were also laid near Naihati station, in continuation of the ‘ In 
The same remarks apply to these sleepers as to the above, only that 
deterioration is somewhat more marked. Their life will be 10 years, 
which could be prolonged were bearing plates used. 
(v) Powellized ‘ Sain.’ 
‘ Sain ’ Terminalia tomentosa Powellized. The ‘ Sain ’ sleepers were 
laid in the same five localities as the ‘ Chir ’ and ‘ Kail,’ and are doing 
well. After 9| years, 86 per cent, of the sleepers are still in A and B 
classes and only 5| per cent, have been rejected. They are also standing 
the more trying cliinate and heavy conditions of running on the Eastern 
Bengal Railway far better than the other species under experiment. 
They are generally an ugly looking lot of sleepers, as they were never 
passed and are full of original defects. This timber is extremely hard 
and requires no bearing plates, while the spike holds well. 
(3) Results of sleepers treated in open tanks with Avenarids 
Carbolineum oil. 
(For details of durability see Appendix II and for detail of treatment and cost see 
Indian Forest Records, Vol. VI, Part IV, pp. 34 and 35.) 
The sleepers treated with Avenarius Carbolineum oil have been from 
seven to eight years in the line. The oil is expensive but highly toxic ; 
the idea of treating them in this way with small quantities of a good 
grade oil was to save expense. The sleepers have done fairly well, 
especially the ‘ Sain ’ ; so far the experiment indicates that it is on the 
whole false economy to spare the antiseptic solution when treating 
sleepers which will be exposed to so drastic conditions as are generally 
found in India. Appendix II gives in detail the results to date, a 
summary of which is as follows : — 
(i) ‘ Chir ’ treated with Avenarius Carbolineum oil. 
Pinus longijolia, ‘ Chir,’ sleepers treated with Avenarius Carbolineum 
oil were laid in the Saharanpur District, North Western Railway, 7| 
years ago. They are now rapidly deteriorating from dry rot, due pro- 
bably to insufficient penetration of the oil, which amounted to only 
4 lbs. per sleeper. There is no sign of white ant attack though the 
sleepers are badly cracking which would admit of their penetrating 
beyond the impregnated tissue. It is evident that heavier impregnation 
is necessary to protect ‘ Chir ’ sleepers. 
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B 
