Not only does the gas jet require
to be adjusted with great precision, but it also needs more or less
adjustment for different qualities of gas. An ordinary hollow or divided
flame is able to take up on its surface any deficiency of air supply;
but with the high power solid flames the outside surface is small, and
the consequence is that one of these burners, adjusted for gas of poor
quality, may, when used with rich gas, give a long hollow or smoky
flame, unless the gas jet be reduced in size. When perfect, the flame
shows a film of green on the surface of the gauze; and if a richer gas
is used, the green film lifts away. To cause this to fall again, and to
produce a solid flame, it is necessary to take out the gas jet, and
tap the end with a hammer until, on trial, it is found correct. If too
small, the green film lies so closely as to make the gauze red hot.
Where the 'tailing up' of the carbonic oxide flame is objectionable,
there is no practical difficulty whatever in constructing these burners
as a ring, with an air supply in the center, which greatly reduces the
length of the 'tail.
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