Hence figures such as
those quoted above for the enrichment value of acetylene inevitably show
a certain want of harmony which is in reality due to the imperfection or
incompleteness of the modes of testing employed. Relatively to another,
one gas appears advantageously merely in virtue of the conditions of
assessing illuminating power having been more favourable to it. Therefore
enrichment values, such as those given, must always be regarded as only
approximately trustworthy in instituting comparisons between either
different diluent gases or different enriching agents.
ACETYLENE MIXTURES FOR RAILWAY-CARRIAGE LIGHTING.--In modern practice,
the gases which are most commonly employed for diluents of acetylene,
under the conditions now being considered, are cannel-coal gas (in
France) and oil-gas (elsewhere). Fowler has made a series of observations
on the illuminating value of mixtures of oil-gas and acetylene. 13.41 per
cent. of acetylene improved the illuminating power of oil-gas from 43 to
49 candles. Thirty-nine-candle-power oil-gas had its illuminating power
raised to about 60 candles by an admixture of 20 per cent. of acetylene,
to about 80 candles by 40 per cent.
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