Occasionally, where local regulations do not forbid, the
entire generator-house may be built as a "lean-to" against some brick
wall which happens to be kept constantly warm, say by having a furnace or
a large kitchen stove on its other side.
In less complicated installations, where there are only two distinct
items in the plant to be protected from frost--generator and holder--or
where generator and holder are combined into one piece of apparatus,
other methods of warming become possible. As the reaction between calcium
carbide and water evolves much heat, the most obvious way of preventing
the plant from freezing is to economise that heat, _i.e._, to retain
as much of it as is necessary within the apparatus. Such a process,
clearly, is only available if the plant is suitable in external form, is
practically self-contained, and comprises no isolated vessels containing
an aqueous liquid. It is indicated, therefore, rather for carbide-to-
water generators, or for water-to-carbide apparatus in which the carbide
chambers are situated inside the main water reservoir--any apparatus, in
fact, where much water is present and where it is all together in one
receptacle.
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