42 inch in
the 10-litre and 0.48 inch in the 15-litre burner. The opening in the
head of the burner through which the mixture of gas and air escapes to
the flame is 0.15 and 0.17 inch in diameter in these two sizes
respectively. The results of some testings made with Schimek burners have
been already given.
[Illustration: FIG. 19.--"SCHIMEK" BURNER.]
The "Knappich" burner, made by the firm of Keller and Knappich of
Augsburg, somewhat resembles the later pattern of the Allgemeine Carbid
und Acetylen Gesellschaft. It has a narrow mixing tube, viz., 0.2 inch in
internal diameter, and a wide burner head, viz., 0.63 inch in internal
diameter for the 25-litre size. The only gauze diaphragm is in the upper
part of the burner head. The opening in the cap of the burner head, at
which the gas burns, is 0.22 inch in diameter. The gas nipple extends
into a domed chamber at the base of the mixing tube, and the internal air
is supplied through four holes in the base-plate of that chamber. No
means of regulating the effective area of the air inlet holes are
provided.
The "Zenith" burner, made by the firm of Gebrueder Jacob of Zwickau, more
closely resembles the Schimek, but the air inlets are in the side of the
lower widened portion of the mixing tube, and are more or less closed by
means of an outside loose collar which may be screwed up and down on a
thread on a collar fixed to the mixing tube.
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