_Soldering Wires._--Clean all insulation from the ends to be soldered
and scrape the ends bright. Lay the ends parallel to each other and,
starting at the middle of the cleaned portion, wrap the ends around each
other, one being wrapped to the right, the other to the left. Hold the hot
iron under the twisted joint and apply flux to the wire. Then dip the iron
in the solder and apply to the twisted portion until the spaces between the
wires are filled with solder. Finish by smoothing the joint and cleaning
away all excess metal by rubbing the hot iron lengthwise. The joint should
now be covered with a layer of rubber tape and this covered with a layer of
ordinary friction tape.
_Steel and Iron._--Steel surfaces should be cleaned, then covered with
clear muriatic acid. While the acid is on the metal, rub with a stick of
zinc and then tin the surfaces with the hot iron as directed. Cast iron
should be cleaned and dipped in strong lye to remove grease. Wash the lye
away with clean water and cover with muriatic acid as with steel. Then rub
with a piece of zinc and tin the surfaces by using resin as a flux.
It is very difficult to solder aluminum with ordinary solder. A special
aluminum solder should be secured, which is easily applied and makes a
strong joint. Zinc or phosphor tin may be used in place of ordinary solder
to tin the surfaces or to fill small holes or cracks. The aluminum must be
thoroughly heated before attempting to solder and the flux may be either
resin or soldering acid.
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