To counteract this difficulty, M. Somzee adopts a
heating burner, A, which he places between the two batswing burners,
B, so that the products of combustion rise in the angle made by the
two lighting flames, as shown; thus greatly increasing their
luminosity while maintaining a low consumption of gas.
M. Somzee also raises the illuminating power of an ordinary flat-flame
burner by causing an obscure effluvium to traverse the dark portion of
the flame. The effect of this is to increase the activity of
decomposition in this portion, so that the particles of carbon are the
more readily set free, and remain longer in suspension in the luminous
zone. The obscure effluvium may be determined between two points by
the electric current, or be caused by the heating of an imperfect
conductor by the current; or, again, it may result from a metal
conductor heated by the reactions produced in the middle of the flame,
by separating the cone of matter in ignition. The effect may be
compared with that obtained by the concentration of two sheets of
flame; but in this case the sheets are formed by the constituent parts
of one and the same flame, whence results a more complete utilization
of the elements composing it. This system is, in fact, a
simplification of the arrangement adopted in the double-flame burner
seen in Fig.
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