The carbide is then
out of water, and except for after-generation, evolution of gas ceases.
On opening G more or less fully, the water more or less quickly reaches
its original position at _l_, and acetylene is again produced.
Manifestly this arrangement is identical with that of A^2 as regards the
periodical immersion of the carbide holder in the liquid; but it is even
worse than the former mechanically because there is no rising holder in
B^1, and the pressure in the service is never constant. B^2 represents
the water store of an unshown generator which works by pressure. It
consists of a vessel divided vertically by means of a partition having a
submerged hole N. One-half, H, is cloned against the atmosphere, but
communicates with the gas space of the generator through L; the other
half, K, is open to the air. M is a pipe leading water to the carbide.
When gas is being burnt as fast as, or faster than, it is being evolved,
the pressure in the generator is small, the level of the water stands at
_l_, and the mouth of M is below it. When the pressure rises by
cessation of consumption, that pressure acts through L upon the water in
H, driving it down in H and up in K till it takes the positions
_l"_, and _l'_, the mouth of M being then above the surface.
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