The latter apparently ought to be called the
Dolan.
[Illustration: FIG. 8.--TYPICAL ACETYLENE BURNERS.]
The essential feature of the Naphey burner is the tip, which is shown in
longitudinal section at A in Fig. 8. It consists of a mushroom headed
cylinder of steatite, drilled centrally with a gas passage, which at its
point is of a diameter suited to pass half the quantity of acetylene that
the entire burner is intended to consume. The cap is provided with four
radial air passages, only two of which are represented in the drawing;
these unite in the centre of the head, where they enter into the
longitudinal channel, virtually a continuation of the gas-way, leading to
the point of combustion by a tube wide enough to pass the introduced air
as well as the gas. Being under some pressure, the acetylene issuing from
the jet at the end of the cylindrical portion of the tip injects air
through the four air passages, and the mixture is finally burnt at the
top orifice. As pointed out in Chapter VII., the injector jet is so small
in diameter that even if the service-pipes leading to the tip contain an
explosive mixture of acetylene and air, the explosion produced locally if
a light is applied to the burner cannot pass backwards through that jet,
and all danger is obviated.
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