In this way it
reaches the burner, and forms an intimate mixture with the small jets
of gas which compose the flame. The gas, on leaving the supply-pipe,
T, fills one of the compartments, S? S squared, of the heater, and then
returns by the second compartment, and again descends by the casing of
the supply-pipe, having its temperature still further raised by
contact with the internal radiation of the flame.
Under these conditions, all the parts of the burner are supplied by
heated air, and the combustion becomes very active; thus increasing
the intensity of the flame, and consequently that of the light
afforded, while at the same time effecting a saving of 50 per cent. of
gas. This burner may be made of any size, and for consumptions not
exceeding that of an ordinary Argand. In fact, the gas is consumed at
a low pressure, escaping with no greater force than that due to the
heat of the products of combustion. It is sufficiently expanded on
coming into contact with the current of hot air, the activity of which
is regulated by the height of the apparatus, that is to say, by that
of its two chimneys. The mixture is made in such proportion as to
obtain from the gas and air as great a degree of luminosity as
possible. The high temperature of the gas, and the independent means
of heating the air and gas, constitute the essential principles of
this burner.
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