The object of using this
treated carbide is to avoid the effects of the attack of atmospheric
humidity or water vapour, which, with ordinary carbide, give rise to the
phenomena of after-generation. The generator comprises a water-tank
_A_ with conical base, a basket _C_ containing the treated
carbide inserted within a cylindrical case _B_ which is open at the
bottom and is surmounted by a cylindrical filter _D_. At starting,
the tank _A_ is filled with water to the level _N N'_. The
water rises within the cylindrical case until it comes in contact with
the treated carbide, which thereupon begins to evolve gas. The gas passes
through the filter _D_, which is packed with dry cotton-wool, and
escapes through the tap _M_. As soon as the contained air has been
displaced by gas the outlet of the tap _M_ is connected by a
flexible tube to the pipe leading to a purifier and the service-pipe.
When the tap _M_ is closed, or when the rate of evolution of the gas
exceeds the rate of consumption, the evolved gas accumulates within the
cylindrical case _B_ and begins to displace the water, the level of
which within the case is lowered from _S S'_, first to _S1 S'1_
and ultimately to, say, _S2 S'2_.
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