By calculation, the area of a gauze surface in a
burner should, therefore, be taken at four times that of the tube, and
our standard of 11/4 inch tube requires a gauze surface of 21/2 inches in
diameter. This rule is subject to variation in burners of a small size,
owing to the air that can, if required, be taken up by the external
surface of the flame, which, of course, is much greater in proportion in
a small flame than in a large one. Where the diameter of the gauze is,
say, not over one or two inches, the theoretical maximum gas supply may
be exceeded, and a varying compensation is necessary with each size.
My rule is intended to apply to burners of larger diameters, where the
external air supply plays a comparatively unimportant part.
[Illustration: Fig. 2.]
"It must be remembered that burners of this class, which burn without
the necessity of an external air supply in a flame which is solid,
require the mixture to be correct in proportions. A very slight
variation makes an imperfect flame.
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