The carbide is held in a chamber closed except at the gas exit
to the burner and at the inlet from the water reservoir: so that if gas
is produced more rapidly than the burner takes it, more water is
prevented from entering, or the water already present is driven backwards
out of the decomposing chamber into some adjoining receptacle. It is
impossible to describe in detail all the lamps which have been
constructed or proposed for vehicular use; and therefore the subject must
be approached in general terms, discussing simply the principles involved
in the design of a safe portable generator.
In all portable apparatus, and indeed in generators of larger dimensions,
the decomposing chamber must be so constructed that it can never, even by
wrong manipulation, be sealed hermetically against the atmosphere. If
there is a cock on the water inlet tube which is capable of being
completely shut, there must be no cock between the decomposing chamber
and the burner. If there is a cock between the carbide vessel and the
burner, the water inlet tube must only be closed by the water, being
water-sealed, in fact, so that if pressure rises among the carbide the
surplus gas may blow the seal or bubble through the water in the
reservoir.
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