The elements are therefore dissociated or separated before their final
combination; thereby raising the calorific and luminous effect to the
highest possible degree. Such a burner can, of course, be made as
small as may be required; thus lending itself admirably to the
subdivision of illumination. The only precaution required is to
properly proportion the sectional area of the hot-air passages to the
radiant surface of the flame, so that the heat does not become too
intense at the lower portion of the burner.
Fig. 8 shows a double flame burner on the principle of Mr. Heron's,
but with admission of hot air into the angle formed by the flames. As
exemplified by Mr. Heron, if two equal batswing burners separately
give a certain amount of light, on the two flames being brought into
contact, so as to form a single flame, the luminosity is considerably
increased, owing to the condensation of heat which results from their
meeting. The two incandescent sheets are, as it were, forced into one
another, so as to be combined.
[Illustration: FIG. 8. DOUBLE FLAT-FLAME BURNER]
The high-power burners of Douglass, Coze, Mallet, and others were
designed on this principle; but its application to uninclosed burners
was not very satisfactory, because the great cooling down of the inner
surface of the flames by the strong draught of cold air impaired their
illuminating power.
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