From Mauricheau-Beaupre's experiments, referred to on
page 106, it would appear that a further reason for avoiding an addition
of calcium chloride to the water used for decomposing carbide should lie
in the danger of causing a troublesome production of froth within the
generator.
It will be convenient to digress here for the purpose of considering how
the generators of an acetylene apparatus themselves should be protected
from frost; but it may be said at the outset that it is impossible to lay
down any fixed rules applicable to all cases, since local conditions,
such as climate, available resources, dimensions, and exposed or
protected position of the plant-house vary so largely in different
situations. In all important installations every item of the plant,
except the holder, will be collected in one or two rooms of a single
building constructed of brick or other incombustible material. Assuming
that long-continued frost reigns at times in the neighbourhood, the whole
of such a building, with the exception of one apartment used as a carbide
store only, is judiciously fitted with a heating arrangement like those
employed in conservatories or hothouses; a system of pipes in which warm
water is kept circulating being run round the walls of each chamber near
the floor.
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