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CHAPTER VIII
COMBUSTION OF ACETYLENE IN LUMINOUS BURNERS--THEIR DISPOSITION
NATURE OF LUMINOUS FLAMES.--When referring to methods of obtaining
artificial light by means of processes involving combustion or oxidation,
the term "incandescence" is usually limited to those forms of burner in
which some extraneous substance, such as a "mantle," is raised to a
brilliant white heat. Though convenient, the phrase is a mere convention,
for all artificial illuminants, even including the electric light, which
exhibit a useful degree of intensity depend on the same principle of
incandescence. Adopting the convention, however, an incandescent burner
is one in which the fuel burns with a non-luminous or atmospheric flame,
the light being produced by causing that flame to play upon some
extraneous refractory body having the property of emitting much light
when it is raised to a sufficiently high temperature; while a luminous
burner is one in which the fuel is allowed to combine with atmospheric
oxygen in such a way that one or more of the constituents in the gas
evolves light as it suffers combustion.
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