The third plan is obviously the best. It can indeed be adopted
where no real constant service of water is at hand by connecting the
generator to a water reservoir of relatively large size and by making the
latter of comparatively large transverse area, in proportion to its
depth; so that the escape of even a largo volume of water from the
reservoir may not involve a large reduction in the level at which it
stands there.
The dust that always clings to lumps of carbide naturally decomposes with
extreme rapidity when the material is thrown into the shoot of a carbide-
to-water generator, and the sudden evolution of gas so produced has on
more than one occasion seriously alarmed the attendant on the plant.
Moreover, to a trifling extent the actual superficial layers of the
carbide suffer attack before the lumps reach the true interior of the
generator, and a small loss of gas thereby occurs through the open mouth
of the shoot. To remove these objections to the hand-fed generator it has
become a common practice in large installations to cause the lower end of
the shoot to dip under the level of some oil contained in an appropriate
receptacle, the carbide falling into a basket carried upon a horizontal
spindle.
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