When the main is carrying full pressure, both of
the jets proper are alight, and the burner behaves normally, but if the
pressure is reduced to a certain point, the movement of the mercury seals
the tubes leading to the main jets, and opens that of the pilot flame,
which alone remains alight till the pressure is increased again. Bray has
patented a modification of the Naphey injector tip, which is shown in
Fig. 12. It will be observed that the four air inlets are at right-angles
to the gas-way; but the essential feature of the device is the conical
orifice. By this arrangement it is claimed that firing back never occurs,
and that the burner can be turned down and left to give a small flame for
considerable periods of time without fear of the apertures becoming
choked or distorted. As a rule burners of the ordinary type do not well
bear being turned down; they should either be run at full power or
extinguished completely. The "Elta" burner, made by Geo. Bray and Co.,
Ltd., which is shown in Fig. 13, is an injector or atmospheric burner
which may be turned low without any deposition of carbon occurring on the
tips. A burner of simple construction but which cannot be turned low is
the "Luta," made by the same firm and shown in Fig.
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