The power of any burner, for any
specified purpose, depends not only on its perfection, but to a far
greater extent on the difference in the temperature of the flame and of
the object to be heated. For instance, if a bright red heat is required,
it is not possible to obtain this temperature economically with any
burner working without an artificial blast of air; the difference
between the temperature of the flame and that of the object heated is
too little to enable the heat to be taken up freely or quickly, and
the result is a large loss of costly fuel. If we want to obtain high
temperatures economically, an artificial blast of air is necessary,
and the heavier the pressure of air, the greater the economy. On the
contrary, low temperatures and diffused heat are obtained best by flames
without any artificial air supply.
For such purposes as ovens, disinfecting chambers, japanners' stoves,
founders' core drying, and similar requirements the best results are
obtained by a number of separate jets of flame at the lowest part of the
inclosed space, and the use of either illuminating or blue flames is a
matter of no importance, as the total amount of heated air from either
character of flame is the same.
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