represents a portion of the chimney-flue construction of a first-rate house; the lower chimney opening is in the basement, and above it are two others, one on the ground floor, and one on the first floor. It will be seen that there are three flues descending or taken down to the basement. The third flue belongs to the room on the second floor. The wall is two bricks thick, the flue 9 in. in diameter, and contained within the wall with no chimney-breast projecting. Fig. 2 is a plan of the flues on the ground floor, and fig. 3 of those on the first floor. Fig. 4 is a section of the fireplace opening; this is 3 ft. in height from the floor-line, the brickwork at top is splayed, and supported by an iron bar; these openings are always filled up with 4½ straight joint work, to be taken out when the mantelpiece is fixed. Fig. 5 is the chimney-pot and its cap, the latter opening at top 7 in. by 9 in. only; fig. 6 shows one of the sweeping doors, in which there are two to each descending flue. The latter three figures are twice the scale of the former. A plan and section of the chimney complete, with its marble mantel and stove, is given in figs. 7 and 8. The flue passes completely down at the back of the stove, the front is closed by an iron plate to a height of 2 ft. On this is fixed the moveable door or register, shut fully or partly over the flue when the stove is in use, and closed over the stove when the flue has to be swept. The arrows show the mode of admission of air to the front of the fire; it is brought through the
Fig. 7.—Plan of stove.
floor and two openings in the back hearth from the outside of the house. This is generally kept concealed,
Fig. 8.—Section.
and in order to ensure a supply of air to the stove the room should be kept completely closed.
To cause as full and perfect a combustion of the fuel as possible, a draught or current of the external air should be always admitted to the stove, and it could easily be placed under open management, so as to admit either a large or small supply of air, as required. Numerous patent processes to effect this are in use, but the most effective way of doing it is that shown in figs. 7 and 8: it is too simple for a patent.
