. . . /| | | | | |
| Coal-gas . . . | 7.9 | 19.1 | 600 | --- | --- |
|________________________|______|______|________|_________|____________|
In making carburetted acetylene, the pressure given by the ordinary
acetylene generator will be sufficient to drive the gas through the
carburettor, and therefore there will be no expense involved beyond the
cost of the spirit vaporised. Thus comparisons may fairly be made between
ordinary and carburetted acetylene on the basis of material only, the
expense of generating the original acetylene being also ignored. In Great
Britain the prices of calcium carbide, petroleum spirit, and 90s benzol
delivered in bulk in country places may be taken at 15L per ton, and
1s. per gallon respectively, petroleum spirit having a specific
gravity of 0.700 and benzol of 0.88. On this basis, a unit volume (100
cubic metres) of plain acetylene costs 1135d., of "petrolised"
acetylene containing 66 per cent. of acetylene costs 1277d., and
of "benzolised" acetylene costs 1180d. In other words, 100 volumes
of plain acetylene, 90 volumes of petrolised acetylene, and 96 volumes of
benzolised acetylene are of equal pecuniary value.
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