Two such bellows are placed side by side, a thin bamboo
tube attached to each, and both entering the one tuyere; and so by
jumping on each bellows alternately, the workman keeps up a continuous
blast.
[Illustration: Fig. 2.--PLAN OF INDIAN BLAST FURNACE AND BLOWING
MACHINE.]
The Figs. 1 and 2 are taken from sketches, and the description from
particulars, by Mr. Blandford, who was for some years on the
Geological Survey of India, and had exceptional opportunities in his
journeyings of observing the customs and occupations of the Indian
iron smelters. The blowing machine is an especially wonderful and
effective machine, and was first described and illustrated by Mr.
Robert Rose, in a Calcutta publication, more than half a century ago.
He also had seen it used in iron making in India.--_Colliery
Guardian._
* * * * *
WOOD OIL.
Wood oil is now made on a large scale in Sweden from the refuse of
timber cuttings and forest clearings, and from stumps and roots.
Although it cannot well be burned in common lamps, on account of the
heavy proportion of carbon it contains, it is said to furnish a
satisfactory light in lamps specially made for it; and in its natural
state it is the cheapest illuminating oil. There are some thirty
factories engaged in its production, and they turn out about 40,000
liters of the oil daily.
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