94 | 7.31 | ... |
| " " | 40 | 15 | 33 | 6.7 | 4.92 | ... |
| " " | 60 | 25 | 60 | 13.4 | 4.40 | ... |
|___________|________|_______|__________|_________|__________|_________|
It will be seen that the original oil-gas, when compressed to 10
atmospheres, gave a light of 1 candle-hour for an average consumption of
7.66 litres in the Bray burners, and for a consumption of 7.11 litres in
the ordinary German oil-gas jets; while the mixture containing 20 per
cent. of acetylene evolved the same amount of light for a consumption of
2.02 litres in Bray burners, or of 2.06 litres in the oil-gas jets.
Again, taking No. 40 as the most popular and useful size of burner, 1
volume of acetylene oil-gas may be said to be equal to 3 volumes of
simple oil-gas, which is the value assigned to the mixture by the German
Government officials, who, at the prices ruling there, hold the mixture
to be twice as expensive as plain oil-gas per unit of volume, which means
that for a given outlay 50 per cent. more light may be obtained from
acetylene oil-gas than from oil-gas alone.
This comparison of cost is not applicable, as it stands, to compressed
oil-gas, with and without enrichment by acetylene, in this country, owing
to the oils from which oil-gas is made being much cheaper and of better
quality here than in Germany, where a heavy duty is imposed on imported
petroleum.
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