of acetylene present: a fact which is usually expressed by
saying that with coal-gas the enrichment value of acetylene is 1 candle
per 1 per cent. Above 8 per cent., the enrichment value of acetylene
rises, Love having found an increase in illuminating power, for each 1
per cent. of acetylene in the mixture, of 1.42 candles with 11.28 per
cent. of acetylene; and of 1.54 candles with 17.62 per cent. of
acetylene. Theoretically, if the illuminating power of acetylene is taken
at 240 candles, its enrichment value should be (240 / 100 =) 2.4 candles
per 1 per cent.; and since, in the case of coal-gas, its actual
enrichment value falls seriously below this figure, it is clear that
coal-gas is not an economical diluent for it. Moreover, coal-gas can be
enriched by other methods much more cheaply than with acetylene. Simple
("blue") water-gas, according to Love, requires more than 10 per cent. of
acetylene to be added to it before a luminous flame is produced; while a
mixture of 20.3 per cent. of acetylene and 79.7 per cent. of water-gas
had an illuminating power of 15.47 candles. Every addition to the
proportion of acetylene when it amounted to 20 per cent.
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