The oil-gas
was also tried at various pressures, and the most favourable result is
taken for computing the ratio in the last column. It is evident from this
table that 1 volume of this acetylene-oil-gas mixture is equal at the
most to 1.65 volume of the simple oil-gas. Whether the mixture will prove
cheaper under particular conditions must depend on the relative prices of
gas-oil and calcium carbide at the works where the gas is made and
compressed. At the prevailing prices in most parts of Britain, simple
oil-gas is slightly cheaper, but an appreciable rise in the price of gas-
oil would render the mixture with acetylene the cheaper illuminant. The
fact remains, however, that per unit weight or volume of cylinder into
which the gas is compressed, acetylene oil-gas evolves a higher candle-
power, or the same candle-power for a longer period, than simple,
unenriched British oil-gas. Latterly, however, the incandescent mantle
has found application for railway-carriage lighting, and poorer
compressed gases have thereby been rendered available. Thus coal-gas, to
which a small proportion of acetylene has been added, may advantageously
displace the richer oil-gas and acetylene mixtures.
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