In H the main carbide vessel is arranged horizontally, or nearly so, and
each partition dividing it into compartments is taller than its
predecessor, so that the whole of the solid in (1) must be decomposed,
and the compartment entirely filled with liquid before it can overflow
into (2), and so on. Since the carbide in all the later receptacles is
exposed to the water vapour produced in that one in which decomposition
is proceeding at any given moment, at least at its upper surface, some
after-generation between vapour and carbide occurs in H; but a partial
control over the temperature may be obtained by water-jacketing the
container. In G the water enters at the base and gas escapes at the top,
the carbide vessels being disposed vertically; hero, perhaps, more after-
generation of the same description occurs, as the moist gas streams round
and over the higher baskets. In K, the water enters at the top and must
completely fill basket (1) before it can run down the depending pipe into
(2); but since the gas also leaves the generator at the top, the later
carbide receptacles do not come in contact with water vapour, but are
left practically unattacked until their time arrives for decomposition by
means of liquid water.
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