The Argand burner with double chimney, shown in Fig. 7, is also an
economical one for a small consumption of gas. The air admitted to
both the inside and the outside is raised to a high temperature by
passing along the spirals of a second and transparent chimney, C?,
which surrounds the cylindrical glass, C. The gas itself is heated by
passing through this hot chamber before reaching the outlet orifices;
so that the mixture of air and gas takes place under the most
favorable conditions for their perfect combustion.
The burner is an ordinary Argand, which may terminate below in a small
chamber for the gas and air to mingle. But this is not necessary; and
the usual arrangement for mixing the air and gas may be adopted. The
outer air enters at the top of the central chimney, C and passes into
the annular space between the two glasses; then descends by the two
spiral passages, which surround the cylindrical glass and terminate
in a portion hermetically sealed by a brass plate attached to the
supply-pipe. All the parts of the burner are thus surrounded by a
highly-heated atmosphere, especially at the bottom of the double
chimney; and it will be readily understood that, if the branches which
lead the gas to the burner are constructed of a highly conductive
metal, the gas will become heated in its turn by passing through
passages raised to a high temperature.
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