[Illustration: IMPROVED GAS BURNER. FIG. 2.--Section through A B.]
The light is simply that produced by an arrangement of a kind of Argand burner turned upside down. The central gas-pipe, _a_ (Figs. 1 and 3), is connected to a distributing chamber, whence the annular cluster of brass tubes, _a', a_, (Figs. 1 and 2), are prolonged downward, forming the burner. The burner is inclosed in an iron or brass annular casing, b, b, which forms the main framework of the apparatus. The annular space which it affords is the outlet chimney or flue for the products of combustion of the burner beneath, and is crossed by a number of thin brass tubes, c, c, which lead from the outer air into the inner space containing the burner tubes, a', a', already described. The upper openings of the annular body, b, are shown at e, e (Fig. 3), which communicate direct with the chimney proper, e', e'. The burner is lighted by opening the hinged glass cover, d, which fits practically air-tight on the bottom of the body, so that the air needed to support combustion must all pass through the tubes, c, c, the outer ends of which are protected by the casing, k, k.
[Illustration: IMPROVED GAS BURNER. FIG. 3.--Section through C D.]