When fluid oil is employed in a generator
of type B^1, evolution of gas becomes so regular that any holder beyond
the displacement one which the apparatus itself constitutes is actually
unnecessary, though still desirable; but B^1, with or without oil, still
remains a displacement apparatus, and as such gives no constant pressure.
It must be admitted that the presence of oil so far governs the evolution
of gas that the movement of the water, and the consequent variation of
pressure, is rendered very small; still a governor or a rising holder
would be required to give the best result at the burners. One point in
connexion with the use of liquid oil must not be overlooked, viz., the
extra trouble it may give in the disposal of the residues. This matter
will be dealt with more fully in Chapter V.; here it is sufficient to say
that as the oil does not mix with the water but floats on the surface,
care has to be taken that it is not permitted to enter any open stream.
The foregoing remarks about the use of oil manifestly only apply to those
cases where it is used in quantity and where it ultimately becomes mixed
with the sludge or floats on the water in the decomposing chamber.
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