The difficulty of constructing atmospheric acetylene burners in which the
flame would not be likely to strike back to the nipple has already been
referred to in connexion with the construction atmospheric burners for
incandescent lighting. Owing, however, to the large proportions of the
atmospheric burners of boiling rings and stove and in particular to the
larger bore of their mixing tube, the risk of the flame striking back is
greater with them, than with incandescent lighting burners. The greatest
trouble is presented at lighting, and when the pressure of the gas-supply
is low. The risk of firing-back when the burner is lighted is avoided in
some forms of boiling rings, &c., by providing a loose collar which can
be slipped over the air inlets of the Bunsen tube before applying a light
to the burner, and slipped clear of them as soon as the burner is alight.
Thus at the moment of lighting, the burner is converted temporarily into
one of the non-atmospheric type, and after the flame has thus been
established at the head or ring of the burner, the internal air-supply is
started by removing the loose collar from the air inlets, and the flame
is thus made atmospheric.
Pages:
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568