to any rooms above it requiring ventilation. N. B. The direction of the first length or piece of the tunnel should, in all cases, be upwards, to prevent sparks of fire, which may fly into it, being conveyed into a room ventilated by a descending tunnel. The tunnel should, at least, rise so far that the lower edge of it may be higher than the upper edge of the shoulder on which it is fixed. M. A back flue to conduct the smoke when all the doors are closed, and the stove made to act with its utmost force. NN. The hobbs on each side the fireplace. Fig. 3. A side view of the ventilating stove, in which the letters cor respond as before. Fig. 4. A view from above of the two chimneys which convey away the smoke, and of the register which closes one or other of them, as occasion may require. Description of the Sash-Window for an Hospital. Plate VIII. Fig. 5. aaaa. A common sash-window frame, the upper extremity of which should be level with the ceiling of the room. b. The lower sash fixed. C. The upper sash working inwards on the pivots e e, at each side of its lower end. dd. Inclined edges fixed, with a proper inclination inwards, on the jambs to which the sash is fitted. These jambs and ledges should be made as exactly as possible to fit the sash in its working, to prevent air from passing inwards by its sides. e e. e e. f. The pivots on which the upper sash-frames move. A regulator, notched on its lower part, and moving in a groove g. At the extremity of the regulator is a loop or ring h, to receive a hook fixed to a long pole, by which the sash may be worked by the apothecary or nurse. The notches in the regulator resting on the groove, admit the sash to be placed at any intermediate distance, required. The pole may be afterwards removed out of the reach of the patients. |