Part I.] Puran Singh: Turpentine Oil and Indian Rosin. '27 
The “ cutting ” of the still in these experiments, however, was not 
done. If oil of quality Z meets the trade demand, then it is recom¬ 
mended that this rapid process of spirit distillation should be 
adopted, as it avoids the partial redistillation. 
It was seen that the purity of the oil depended directly on the 
strength of spirit used, the number of hours taken in distillation, and 
the temperature. When the spirit became dilute, the temperature 
of the still rose and the fractions of the oil obtained, passing over 
below 165° C., ranged from 53 per cent, to 85 per cent. 
The following table shows the laboratory results of the examina¬ 
tion of seven samples by fractional distillation. These samples were 
rapidly distilled by the spirit process at Bhowali by the ordinary 
staff there employed : — 
Sample 
No. 
Distilling between 
155°—160° C. 
Distilling between 
160°—165° C. 
Residue above 
165° C. 
1 
13% 
40% 
17% 
2 
15% 
60% 
25% 
3 
13% 
45% 
42% 
4 
12% 
60% 
28% 
5 
15% 
70% 
15% 
6 
15% 
65% 
20% 
7 
15% 
60% 
25% 
The above shows the variations in the quality of the oil depending 
on the strength of the spirit employed, and how necessary it is to 
keep the spirit of uniform strength. 
The samples labelled A and B at the factory were again fraction¬ 
ated at Dehra after about two months. They were kept stored some¬ 
what exposed to the air. 
A. 
155°—160° C. 20 per cent. 
160°—165° C.70 
Above 165° C.10 
[ 27 ] 
