[Illustration: FIG. 9.--IMPROVED PHOS BURNER.]
[Illustration: FIG. 10.--"WONDER" SINGLE AND TWO-FLAME BURNERS.]
[Illustration: FIG. 11.--"SUPREMA" NO. 266651, TWO-FLAME BURNER.]
[Illustration: FIG. 12.--BRAY'S MODIFIED NAPHEY INJECTOR BURNER TIP.]
[Illustration: FIG. 13.--BRAY'S "ELTA" BURNER.]
[Illustration: FIG. 14.--BRAY'S "LUTA" BURNER.]
[Illustration: FIG. 15.--BRAY'S "SANSAIR" BURNER.]
[Illustration: FIG. 16.--ADJUSTABLE "KONA" BURNER.]
In the original Billwiller burner, the injector gas orifice was brought
centrally under a somewhat larger hole drilled in a separate sheet of
platinum, the metal being so carried as to permit entry of air. In order
to avoid the expense of the platinum, the same principle was afterwards
used in the design of an all-steatite head, which is represented at D in
Fig. 8. The two holes there visible are the orifices for the emission of
the mixture of acetylene with indrawn air, the proper acetylene jets
lying concentrically below these in the thicker portions of the heads.
These two types of burner have been modified in a large number of ways,
some of which are shown at C, E, and F; the air entering through saw-
cuts, lateral holes, or an annular channel.
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