Naturally both F^1 and F^3 can
be fitted with water jackets, as is indicated by the dotted lines in the
second sketch; but unless the generating chamber in quite small and the
evolution of gas quite slow, the cooling action of the jacket will not
prove sufficient. As the water in F^1 and F^3 is not capable of backward
motion, the decomposing chambers cannot be employed as displacement
holders, as is the case in the dipping generator pictured at B^1, Fig. 2.
They must be coupled, accordingly, to a separate holder of the
displacement or, preferably, of the rising type; and, in order that the
gas evolved by after-generation may not be wasted, the automatic
mechanism must cut off the supply of water to the generator by the time
that holder is two-thirds or three-quarters full.
[Illustration: FIG. 4.--TYPICAL METHODS OF DECOMPOSING CARBIDE (WATER TO
CARBIDE).]
[Illustration: FIG. 5.--TYPICAL METHODS OF DECOMPOSING CARBIDE (WATER TO
CARBIDE).]
The diagrams G, H, and K in Figs. 4 and 5 represent three different
methods of constructing a generator which belongs either to the contact
type (F^3) if the supply of water is essentially continuous, _i.e._,
if less is admitted at each movement of the feeding mechanism than is
sufficient to submerge the carbide in each receptacle; or to the flooded-
compartment type (F') if the water enters in large quantities at a time.
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