6; but the precise devices
used in many actual apparatus are so various that it is difficult to
portray them generically. Moreover it is desirable to subdivide automatic
carbide-to-water generators, according to the size of the carbide they
are constructed to take, into two or three classes, which are termed
respectively "large carbide-feed," "small carbide-feed," and "granulated
carbide-feed" apparatus. (The generator represented at L does not really
belong to the present class, being non-automatic and fed by hand; but the
sketch is given for completeness.) M is an automatic carbide-feed
generator having its store of carbide in a hopper carried by the rising-
holder bell. The hopper is narrowed at its mouth, where it is closed by a
conical or mushroom valve _d_ supported on a rod held in suitable
guides. When the bell falls by consumption of gas, it carries the valve
and rod with it; but eventually the button at the base of _c_
strikes the bottom of the generator, or some fixed distributing plate,
and the rod can descend no further. Then, when the bell falls lower, the
mushroom _d_ rises from its seat, and carbide drops from the hopper
into the water.
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