Owing to its shape and the
sliding motion with which the carbide receptacle is put into the
container these generators are usually termed "drawer" generators. In
comparison with type G, the drawer generator H certainly exhibits a lower
rise in temperature when gas is evolved in it at a given speed and when
the carbide receptacles are constructed of similar dimensions. It is very
desirable that the whole receptacle should be subdivided into a
sufficient number of compartments and that it should be effectively
water-cooled from outside. It would also be advantageous if the water-
supply were so arranged that the generator should be a true flooded-
compartment apparatus, but experience has nevertheless shown that
generators of type H do work very well when the water admitted to the
carbide receptacle, each time the feed comes into action, is not enough
to flood the carbide in one of the compartments. Above a certain size
drawer generators are usually constructed with two or even more complete
decomposing vessels, arrangements being such that one drawer can be taken
out for cleaning, whilst the other is in operation. When this is the case
a third carbide receptacle should always be employed so that it may be
dry, lit to receive a charge of carbide, and ready to insert in the
apparatus when one of the others is withdrawn.
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