and upwards of
the mixture had a very appreciable effect on the illuminating power of
the latter. Thus with 27.84 per cent. of acetylene, the illuminating
power of the mixture was 40.87 candles; with 38.00 per cent. of acetylene
it was 73.96 candles. Acetylene would not be an economical agent to
employ in order to render water-gas an illuminating gas of about the
quality of coal-gas, but the economy of enrichment of water-gas by
acetylene increases rapidly with the degree of enrichment demanded of it.
Carburetted water-gas which, after compression under 16 atmospheres
pressure, had an illuminating power of about 17.5 candles, was enriched
by additions of acetylene. 4.5 per cent. of acetylene in the mixture gave
an illuminating power of 22.69 candles; 8.4 per cent., 29.54 candles;
11.21 per cent., 35.05 candles; 15.06 per cent., 42.19 candles; and 21.44
per cent., 52.61 candles. It is therefore evident that the effect of
additions of acetylene on the illuminating power of carburetted water-gas
is of the same order as its effect on coal-gas. The enrichment value of
the acetylene increases with its proportion in the mixture; but only when
the proportion becomes quite considerable, and, therefore, the gas of
high illuminating power, does enrichment by acetylene become economical.
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