387,359. Solid-fuel stoves and furnaces. UBBENS, C. G. E., 7, Sonnenbergstrasse, Berne, Switzerland. June 26, 1931, No. 18530. Convention date, Oct. 10, 1930. [Class 126.] Closed solid-fuel stoves cooking- ranges ; open fireplaces ; feeding ; coking-chambers ; boilers, arrangement of.-In a stove or furnace solid fuel is distilled and partially burnt in a coking-chamber to which air is supplied ; the fuel residues are then burnt in a combustion chamber connected by a short direct flue to the chimney, and the gases distilled in the coking-chamber are burnt in a separate combustion chamber, forming part of a long, indirect flue between the coking- chamber and the chimney. The draught in the latter flue is maintained by that due to the shorter flue from the combustion chamber in which the fuel residues are burnt. Fig. 1 shows a furnace comprising a chamber 1 in which the fuel is dried by the heat from a surrounding water boiler 11, and from which it passes to a coking chamber 2, to the centre of which air is supplied through an opening 21 by a passage 22 from the ash-pit. The coked and partially-consumed fuel is burnt on the inclined and horizontal grates 33, 34, the gases passing from the combustion chamber 3 by a direct flue 7 to the outlet 9. The gases evolved in the coking chamber 2 pass, mixed with air, under the edge 24 of one wall of the chamber and thence through an opening 36 to a lateral " fire chamber " 4, from whence they pass to a vertical tubular chamber 5 in which complete combustion occurs. They then descend the " smoke chamber " 6 formed by the body of the furnace, and finally ascend the flue 8 leading to the outlet. Dampers 71, 81 on a common spindle simultaneously and inversely control the flues 7, 8. The gases during their passage through the flues 4, 5, 6 are mixed owing to the sudden change in direction and cross-section at the opening 41 between the flues 4, 5, and by a baffle device 51 at the top of the flue 5. Figs. 5 and 6 show respectively a kitchen range and a locomotive furnace in which the same references indicate similar parts to those in Fig. 1, i.e. 1 is the fuel-drying chamber, 2 the coking chamber with air-inlets 21, 3 the combustion chamber for the fuel residues, 4 an inverted U-shaped " fire-chamber," 5 a series of tubes forming the combustion chamber, and 6 the heating chamber in which the gases give up their heat. As before, the gases distilled in the chamber 2 pass in succession through the chambers 4, 5, 6. In the range shown in Fig. 5 the tubes 5 each discharge into a chamber under a hot-plate opening 61, the gases passing from these chambers to the space 6 surrounding the oven by openings controlled by a damper 53. The invention is also illustrated as applied to : (a) an open fireplace, in which the fuel-hopper is formed as a rotatable part cylindrical member which is filled with fuel and then inverted to empty it into the coking chamber, which is thus always sealed from the room ; (b) a sectional boiler, in which the chambers 4, 5 are formed by flues between each pair of sections, and the chamber 6 as a pair of flues extending longitudinally through all the sections ; and (c) a watertube boiler with a travelling grate, in which the various chambers and flues are similarly arranged to those in Fig. 6, with the exception that the gases from the combustion chamber 3 do not pass through the chamber 6 on their way to the outlet.