The clear lime-water will then be pumped back
into the generator for further use, and the almost solid sludge will be
ready to be carried to the pit where it is to be buried. Special care
must be taken in disposing of the residues from a generator in which oil
is used to control evolution of gas. Such oil floats on the aqueous
liquid; and a very few drops spread for an incredible distance as an
exceedingly thin film, causing those brilliant rainbow-like colours which
are sometimes imagined to be a sign of decomposing organic matter. The
liquid portions of these residues must be led through a pit fitted with a
depending partition projecting below the level at which the water is
constantly maintained; all the oil then collects on the first side of the
partition, only water passing underneath, and the oil may be withdrawn
and thrown away at intervals.
CHAPTER VI
THE CHEMICAL AND PHYSICAL PROPERTIES OF ACETYLENE
It will only be necessary for the purpose of this book to indicate the
more important chemical and physical properties of acetylene, and, in
particular, those which have any bearing on the application of acetylene
for lighting purposes.
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