•90 
Indian Forest Records. 
[Vol. VJ 
TABLE XXIX. 
Results of treating Indian species of timber according to the Riiping process 
at Hull , England . 
Oil used in I 
treatment. 1 
Serial 
No. of 
experi¬ 
ment. 
Species. 
No. of 
M. G. 
sleepers 
on which 
the aver¬ 
age is 
based. 
I 
Dipterocarpus turbinatus 
or ‘ Gurjan from 
Andamans. 
7 
O 
c 
o 
II 
Dipterocarpus tubercula¬ 
tus, or ‘ In from 
Burma. 
7 
o 
o 
a 
III 
Dipterocarpus alatus or 
‘Kanyin *, from Burma. 
8 
o 
o 
IV 
Dipterocarpus pilosus or 
‘ Hollong from Assam. 
8 
o 
o 
1 
V 
Terminalia Manii, or 
‘ Black Chuglam’, from 
Andamans. 
7 
Si) 
o 
O 
VI 
Terminalia, tomentosa or 
‘ Sain ’ from Central 
Provinces. 
8 
CD 
VII 
Terminalia myriocarpa or 
‘ Hollock ’. from Assam. 
8 
' | 
VIII 
Pinus longifolia, or * Chir *, 
from the United Pro¬ 
vinces. 
4 
Average quantity of oil 
absorbed, in lbs. 
4- 57 lbs. per c. ft. or 
6 - 85 lbs. per M. G. 
sleeper. 
1*77 lbs. per c. ft. or 
2-65 lbs. per M. G. 
sleeper. 
4*83 lbs. per c. ft. or 
7'25 lbs. per M. G. 
sleeper. 
5- 58 lbs. per c. ft. or 
8*37 lbs. per M. G. 
sleeper. 
1*77 lbs. per c. ft. or 
2*65 lbs. per M. G. 
sleeper. 
2*125 lbs. per c. ft. or 
3*19 lbs. per M. G. 
sleeper. 
2*87 lbs. per c. ft. or 4*3 
lbs. per M. G. sleep¬ 
er. 
4*87 lbs. per c. ft. or 
7*3 lbs. per M. G. 
sleeper. 
Remakes. 
Fair penetration. 
Absorption probably 
insufficient to protect 
the timber. 
Fair penetration. 
Penetration quite satis¬ 
factory. 
Absorption probably 
insufficient to protect 
the timber. 
Absorption below the 
mark. 
Ditto 
Absorption satisfactory. 
In reviewing the results obtained from these experiments, it must 
always be borne in mind that the Riiping process is an “ Open Cell ” 
treatment, so that the amount of oil taken up per sleeper is somewhere 
about half the amount that would be taken up in the case of a “ Full 
Cell ” process. Nevertheless, the amount of oil taken up by the 
Dipterocarpus tuberculatus , Terminalia Manii, T. tomentosa and T. 
myriocarpa sleepers is probably insufficient, and that by Diptero- 
■carpus turbinatus hardly sufficient. To make these timbers take up 
more oil, longer treatment sooner than a high pressure is recommended. 
The behaviour of the sleepers treated by this process will be care¬ 
fully watched as, if successful, it may be of great value to India, where 
-economy in oil is of paramount importance. 
{Hi) Treatment of Indian species of timber by the common or 
“ FULL CELL ” PROCESS. 
In 1914, the question of treating certain Andaman JDipterocarps came 
under consideration, and, in order to ascertain whether Dipterocarpus 
turbinatus. would lend itself to treatment, no pressure plant existing at 
that time in India, a batch of sleepers were sent to England to be tested. 
The work was carried out by Messrs. George Black & Sons, Creosoting 
[ 220 j 
