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Batswing

This has a single slit at the top of the burner. It is very steady; does not change its form under any pressure. It is, therefore, used in street lamps. It is not, however, economical.

Fish-tail. This form is generally used in houses; it has two openings in the top, from which the jets of gas issue and form a flat flame, the plane of which is at right angles to that of the openings.

When the pressure is too great the flame elongates and sings, thus calling attention to the waste. It is an economical burner, but flickers. This unsteadiness is trying to the eyes, and the fish-tail should never be used to read or write by.

Argand. These are the steadiest and most economical burners, but require a chimney. The gas is allowed to escape by a ring of holes, and the air is admitted both inside and outside of this ring. In the patent Argand the outer ring of air passes through a series of small openings, and the 0-0848 | inner ring is deflected into the flame by a button;