Since any water pump or similar apparatus would be in an
outhouse or basement, and the most important heating stove (the cooker)
be in the kitchen, such an arrangement would be neither complicated nor
involve a costly duplication of pipes.
It follows from the fact that even a trifling proportion of vapour
reduces the upper limit of explosibility of mixtures of acetylene with
air, that the gas may be so lightly carburetted as not appreciably to
suffer in illuminating power when consumed in self-luminous jets, and yet
to burn satisfactorily in incandescent burners, even if it has been
generated in an apparatus which introduces some air every time the
operation of recharging is performed. To carry out this idea, Caro has
suggested that 5 kilos. of petroleum spirit should be added to the
generator water for every 50 cubic metres of gas evolved, _i.e._, 1
lb. per 160 cubic feet, or, say, 1 gallon per 1000 cubic feet, or per 200
lb. of carbide decomposed. Caro proposed this addition in the case of
central installations supplying a district where the majority of the
consumers burnt the gas in self-luminous jets, but where a few preferred
the incandescent system; but it is clearly equally suitable for
employment in all private plants of sufficient magnitude.
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