Even if there is no issue of gas from the holder, the position
of the bell will alter with every variation in temperature of the stored
gas or surrounding air, and with every movement of the barometer, rising
as the temperature rises and as the barometer falls, and _vice
versa_, while, unless the water in the seal is saturated with
whatever gas the holder contains, the bell will steadily drop a little an
part of its contents are lost by dissolution in the liquid.
PIPES AND FITTINGS.--As a general rule it is unadvisable to use lead or
composition pipe for permanent acetylene connexions. If exposed, it is
liable to be damaged, and perhaps penetrated by a blow, and if set in the
wall and covered with paper or panel it is liable to be pierced if nails
or tacks should at any time be driven into the wall. There is also an
increased risk in case of fire, owing to its ready fusibility. If used at
all--and it has obvious advantages--lead or composition piping should be
laid on the surface of the walls, &c., and protected from blows, &c., by
a light wooden casing, outwardly resembling the wooden coverings for
electric lighting wires. It has been a common practice, in laying the
underground mains required for supplying the villages which are lighted
by means of acetylene from a central works in different parts of France,
to employ lead pipes.
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