Fig. 10.
flue, and gathers it up to a size having an internal dimension of 6 + 4½. It is 21 inches in height. 2, the second piece, is on a curve; the top and bottom lines, if carried on, would form an angle of 45°; it is about 18 inches in height, and internal size 6 + 4½. The third, 3, is a straight piece, internal size 6 + 4½, the lengths various. Fig. 11 gives a plan of four flues and an elevation of the commencement of two. The sweeping doors are shown below. The flue without a door is the ventilating flue for the basement. The ease with which this tubing can be grouped is shown in fig. 12. The stack consists of five flues; the tube, 2, connects them together below, and
Fig. 11.
separates them above. The stack above the roof is 4 feet 9 inches in length.
Fig. 13 shows, in the upper plan, how the flue wall could be reduced in thickness, made a brick and a half only, with a two-brick block at each end; it contains coupled and tripled sets of tubes.
The middle plan shows nine flues grouped together, the centre being that belonging to the kitchen. The last plan shows a group of six in a two-and-a-half-brick wall; by the side of this are two flues of the common construction, 14 inches by 9, made of this
Fig. 12.
size to enable a boy to get up to the top and place his head out of the chimney-pot.