K, therefore, is the best arrangement of parts to
avoid after-generation, overheating, and polymerisation of the acetylene
whether the generator be worked as a contact or as a flooded-compartment
apparatus; but it may be freely admitted that the extent of the
overheating due to reaction between water vapour and carbide may be kept
almost negligible in either K, H, or G, provided the partitions in the
carbide container be sufficient in number--provided, that is to say, that
each compartment holds a sufficiently small quantity of carbide; and
provided that the quantity of water ultimately required to fill each
compartment is relatively so large that the temperature of the liquid
never approaches the boiling-point where vaporisation is rapid. The type
of generator indicated by K has not become very popular, but G is fairly
common, whilst H undoubtedly represents the apparatus which is most
generally adopted for use in domestic and other private installations in
the United Kingdom and the Continent of Europe. The actual generators
made according to the design shown by H usually have a carbide receptacle
designed in the form of a semi-cylindrical or rectangular vessel of steel
sliding fairly closely into an outside container, the latter being either
built within the main water space of the entire apparatus or placed
within a separate water-jacketed casing.
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