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candle-power per litre-hour, and acetylene diluted with air to develop
1.51 candle-power. When, however, allowance is made for the cost and
trouble of preparing such mixtures the advantage of the process
disappears; and moreover it is accompanied by too grave risks, unless
conducted on a largo scale and under most highly skilled supervision, to
be fit for general employment.
Fouche, however, has since found the duty, per cubic foot of neat
acetylene consumed in a twin injector burner at the most advantageous
rate of 3.2 inches, to be as follows for mixtures with air in the
proportions stated:
Percentage of air 0 17 27 33.5
Candles per cubic feet 38.4 36.0 32.8 26.0
At lower pressures, the duty of the acetylene when diluted appears to be
relatively somewhat higher. Figures which have been published in regard
to a mixture of 30 volumes of air and 70 volumes of acetylene obtained by
a particular system of producing such a mixture, known as the "Molet-
Boistelle," indicate that the admixture of air causes a slight increase
in the illuminating duty obtained from the acetylene in burners of
various sizes.
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