The
employment of a limpid oil, such as paraffin, as an intermediate liquid
into which carbide is introduced on its way to the water in the
decomposing vessel of a hand-fed generator in the manner described on
page 70 is something quite different, because, except for trifling
losses, one charge of oil should last indefinitely.
RISING GASHOLDERS.--Whichever description of holder is employed in an
acetylene apparatus, the gas is always stored over, or in contact with, a
liquid that is essentially water. This introduces three subjects for
consideration: the heavy weight of a large body of liquid, the loss of
gas by dissolution in that liquid, and the protection of that liquid from
frost in the winter. The tanks of rising holders are constructed in two
different ways. In one the tank is a plain cylindrical vessel somewhat
larger in diameter than the bell which floats in it; and since there must
be nearly enough water in the tank to fill the interior of the bell when
the latter assumes its lowest position, the quantity of water is
considerable, its capacity for dissolving acetylene is large, and the
amount of any substance that may have to be added to it to lower its
freezing-point becomes so great as to be scarcely economical.
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