Other attempts were made by placing two non-
injector jets in such mutual positions that the two streams of gas met at
an angle, there to spread fan-fashion into a flat flame. This is really
nothing but the old fish-tail coal-gas burner--which yields its flat
flame by identical impingement of two gas streams--modified in detail so
that the bulk of the flame should be at a considerable distance from the
burner instead of resting directly upon it. In the fish-tail the two
orifices are bored in the one piece of steatite, and virtually join at
their external ends; in the acetylene burner, two separate pieces of
steatite, three-quarters of an inch or more apart, carried by completely
separate supports, are each drilled with one hole, and the flame stands
vertically midway between them. The two streams of gas are in one
vertical plane, to which the vertical plane of the flame is at right
angles. Neither of these devices singly gave a solution of the
difficulty; but by combining the two--the injector and the twin-flame
principle--the modern flat-flame acetylene burner has been evolved, and
is now met with in two slightly different forms known as the Billwiller
and the Naphey respectively.
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