]
Among other applications of a long narrow flame of high power, may be
mentioned the brazing of long lengths of tube, in fact the application
of flames of this form, with and without a blast of air, for different
temperatures, are almost endless.
The thousands of uses to which blowpipes are adapted are so well known,
that they need no mention, except the curiously ignored fact that the
power of any blowpipe depends on the air pressure. A compact flame of
high temperature cannot be obtained except with a heavy air pressure,
and the ignorance of this fact has caused an immense number of
unexplained failures. Many people think that one blower is as good as
another, and expect that a fan giving a pressure equal to, say, the
height of a two inch column of water should do the same work as a blower
giving a pressure ten to twenty times as great. The construction and
power of blowpipes, with the laws ruling the proportions and power, will
be found in an article on "Blowpipe Construction," published in _Design
and Work_, March, 1881, and as the matter is there fully treated, no
further reference to the subject is necessary.
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