of this
book, the most convenient and efficient apparatus for performing the
operation is the oxy-acetylene blow-pipe, which can be employed so as to
convert two separate pieces of similar metal into one homogeneous whole.
In less critical situations in an acetylene plant, such as the partitions
of a carbide container, &c., where the collapse of the seam or joint
would not be followed by any of the effects previously suggested, there
is less cause for prohibiting the use of unfortified solder; but even
here, two or three rivets, just sufficient to hold the metal in position
if the solder should give way, are advisedly put into all apparatus. In
other portions of an acetylene installation where a merely soldered joint
is exposed to warm damp gas which is in process of cooling, instead of
being bathed in hard water, an equal, though totally dissimilar, danger
is courted. The main constituent of such solders that are capable of
being applied with the bitt is lead; lead is distinctly soluble in soft
or pure water; and the water which separates by condensation out of a
warm damp gas is absolutely soft, for it has been distilled. If
condensation takes place at or near a soldered joint in such a way that
water trickles over the solder, by slow degrees the metallic lead will be
dissolved and removed, and eventually a time will come when the joint is
no longer tight to gas.
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