In these conditions it does not travel
backwards to the nipple. In other heating burners it is generally
necessary to turn on the gas tap a few seconds before applying a light to
the burner or ring or stove; the gas streaming through the mixing tube
then fills it with acetylene and air mixed in the proper working
proportions, and when the light is applied, there is no explosion in the
mixing tube, or striking-back of the flame to the nipple.
Single or two-burner gas rings for boiling purposes, or for heating
cooking ovens, known as the "La Belle," made by Falk Stadelmann and Co.,
Ltd., of London, may be used at as low a gas pressure as 2 inches, though
they give better results at 3 inches, which is their normal working
pressure. The gas-inlet nozzle or nipple of the burner is set within a
spherical bulb in which are four air inlets. The mixing tube which is
placed at a proper distance in front of the nipple, is proportioned to
the rate of flow of the gas and air, and contains a mixing chamber with a
baffling pillar to further their admixture. A fine wire gauze insertion
serves to prevent striking-back of the flame. A "La Belle" boiling ring
consumes at 3 inches pressure about 48 litres or 1.
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