For type-founding machines, bullet moulding, stereotype metal melting,
solder making, lead melting, etc., one burner, or rather one flame,
should be used of a suitable power for the work, and this should be as
perfect and of as high a temperature as possible to insure economy. It
is now a simple matter, owing to recent researches in the theory of
heating burners, to obtain flames of any power without practical limit,
which, without any artificial air supply, will do all which is necessary
in this class of work, and the required arrangements are exceedingly
simple. With these trades may be classed, also, the concentration and
distillation of acids and liquids boiling at a high temperature, and we
may also include baths for tinning small articles, and the tinning by
fusion of sheet copper, the same burners being applicable, and perfectly
suited to all these requirements, unless the tinning baths are long and
narrow, in which case the furnace-bar burners again come to the front as
the best; as, if we are to use gas economically, the flame must be the
same shape as the vessel to be treated.
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