This lamp throws its light vertically downward; and its illuminating
power may be increased by providing, above the incandescent sheet, a
reflector, which diverts into a useful direction the rays thrown
toward the ceiling. In this arrangement of lamp the flame is
excessively condensed by its being turned back over the refractory
guide; and this condensation greatly favors the production of light.
On the other hand, the combustion of the gas is very perfect, because
the currents of hot air are thrown directly upon the two sides of the
flame; and thus the reciprocal action becomes more intense. Lastly,
the division of the gas into a large number of small jets, in contact
with which the hot air forms an intimate mixture, causes a greater
quantity of molecules to partake in the combinations; thus affording a
proportionate increase of temperature in a given space and time.
[Illustration: FIG. 5. REGENERATIVE BURNER WITH FLAME DEFLECTED
OUTWARD.]
Owing to these various circumstances, the final effective duty of this
burner is advantageous, so that it yields an illuminating power which
may be put at from 200 to 250 per cent. above that of ordinary
burners, and about 25 per cent. more than that of other regenerative
burners. The flame is comparatively steady; the loss due to the
friction over the white porcelain being almost eliminated, because the
flame only presses upon the guide for a small portion of its surface,
and is only spread out to the extent of its dark zone.
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