Experience tends to show
that they may be employed, first, provided they are designed to take
granulated carbide--which in comparison with larger grades is much more
uniform and cylindrical in shape--and secondly, provided the quantity of
carbide in the hopper does not exceed a few pounds. The phenomenon of the
sudden unexpected descent of the carbide, popularly known as "dumping,"
can hardly be avoided with carbide larger in size than the granulated
variety; and since the results of such an accident must increase in
severity with the size of the apparatus, a limit in their capacity is
desirable.
[Illustration: FIG. 6.--TYPICAL METHODS OF DECOMPOSING CARBIDE (CARBIDE
TO WATER).]
When it is required to construct a carbide-feed generator of large size
or one belonging to the large carbide-feed pattern, it is preferable to
arrange the store in a different manner. In N the carbide is held in a
considerable number of small receptacles, two only of which are shown in
the drawing, provided with detachable lids and hinged bottoms kept shut
by suitable catches. At proper intervals of time those catches in
succession are knocked on one side by a pin, and the contents of the
vessel fall into the water.
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