698 FEDERAL BBFORTEB. �upward and become mixed and go to the flame. In some of them the mixture burnt upon the diaphragm ; in others there ■were caps over the upper ends of the tubes larger than the tubes, and forming a chamber above the diaphragm, in the sides of which were holes for the mixture to pass out through, and it was burned in jets as it escaped through the holes. The chamber was generally larger than the tube below, and made separate from it, and both were put together so as to hpld the diaphragm in place. In ail these the caps were held by the sides of the chamber through which the mixture must pass, and which could not be perforated to give an unbroken sheet of the mixture to the flame without weakening them too much for such support. Kelly appears to have invented a humer head consisting of two ciroular horizontal plates, one above the other, with flanges approaching each other afound the edges, leaving a oontinuous aperture, and having a ver- tical diaphragm extending around between them a short distance inside of the flanges, forming an annular chamber between the diaphragm and flanges, ail held together by a boit and nnt in the center of the plates, with an aperture leading from the feeding tube below through the lower plate, each side of a bar left across for the boit, so as to pass the air and gas upward through the tube and lower plate into the space between the plates, theuce laterally in ail directions through tho diaphragm into the chamber outside of it, and thence in an unbroken sheet horizontally through the aper- ture between the flanges to the flame, thus supplying a con- tinuons flame ail around the edge of the upper plate and effecting thorough combustion of the gas. �In the specifications of his patent he described the whole of this arrangement; set forth the nature of his invention as consisting in forming a chamber in the burner between the perforated diaphragm and the external opening, and in the employment of a vertical diaphragm in combination with an annular opening around the same; and the claim was the combination of a vertically arranged diaphragm with the external annular opening, as therein shown. The specifica- tions of the re-issue are not materially different from those of ����
