In 1902 Javal stated that it was possible to
burn thoroughly purified acetylene in twin non-injector burners, provided
the two jets, made of steatite as usual, were arranged horizontally
instead of obliquely, the two streams of gas then meeting at an angle of
180 deg., so as to yield an almost circular flame. According to Javal,
whereas carbonaceous growths were always produced in non-injector
acetylene burners with either oblique or horizontal jets, in the former
case the growths eventually distorted the gas orifices, but in the latter
the carbon was deposited in the form of a tube, and fell off from the
burner by its own weight directly it had grown to a length of 1.2 or 1.5
millimetres, leaving the jets perfectly clear and smooth. Javal has had
such a burner running for 10 or 12 hours per day for a total of 2071
hours; it did not need cleaning out on any occasion, and its consumption
at the end of the period was the same as at first. He found that it was
necessary that the tips should be of steatite, and not of metal or glass;
that the orifices should be drilled in a flat surface rather than at the
apex of a cone, and that the acetylene should be purified to the utmost
possible extent.
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