strength is now used as the solvent.
Turning to the other end of the scale of solubility, the most valuable
liquids for serving as seals of gasholders, &c., are readily discernible.
Far superior to all others is a saturated solution of calcium chloride,
and this should be selected as the confining liquid whenever it is
important to avoid dissolution of acetylene in the liquid as far as may
be. Brine comes next in order of merit for this purpose, but it is
objectionable on account of its corrosive action on metals. Olive oil
should, according to Fuchs and Schiff, be of service where a saline
liquid is undesirable; mineral oil seems useless. Were they concordant,
the figures for milk of lime would be particularly useful, because this
material is naturally the confining liquid in the generating chambers of
carbide-to-water apparatus, and because the temperature of the liquid
rises through the heat evolved during the generation of the gas
(_vide_ Chapters II. and III.). It will be seen that these figures
would afford a means of calculating the maximum possible loss of gas by
dissolution when a known volume of sludge is run off from a carbide-to-
water generator at about any possible temperature.
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