. The book of the garden. Gardening. 290 VENTILATION. Fig. side wall 2 feet by 10 inches, placed close to the floor, and furnished with box ven- tilators in Atkinson's manner. In the other case, the same kind of ventilators are built in the front wall. The cold air admitted by them has to pass up the side of a hot-water tank, and becomes thereby warmed before coming in contact with the plants. The back wall is built hol- low, and openings 4 inches square are made on the outside, near the top, by which cold air enters, and, descending the wall, enters the house by similar openings close t
. The book of the garden. Gardening. 290 VENTILATION. Fig. side wall 2 feet by 10 inches, placed close to the floor, and furnished with box ven- tilators in Atkinson's manner. In the other case, the same kind of ventilators are built in the front wall. The cold air admitted by them has to pass up the side of a hot-water tank, and becomes thereby warmed before coming in contact with the plants. The back wall is built hol- low, and openings 4 inches square are made on the outside, near the top, by which cold air enters, and, descending the wall, enters the house by similar openings close to the floor. This latter ventilation is left open day and night. Ventilators in the back walls of houses may also be opened and shut very con- veniently, even when at a considerable height, by hanging them at top with hinges, or by pivots at their centres, and attaching them to a long rod of iron, per- forated with holes at the lower end, to fix on pins or iron studs driven into the wall. Fig. 392 will show the principle. And front ones, if hung so as to open inwards, may be opened and shut without treading upon the border, by attaching a line to their lower edge, to be brought over a small brass pulley, fixed to the inner edge of the wall-plate, car- ried upwards under the roof, and made to pass over another pulley, fixed to the under side of the top-rail of the bottom sash, leaving a sufficient length of line to hang down to be within the conve- nient reach of a person standing in the footpath. A slight pull of this line will open the lid of the ventilator to any extent; and if the end of the line be furnished with a small iron or brass eye, it may be fastened to hooks in the back wall, so as to give sufficient head-room over the passage. To secure the shutting of the ventilator, it should be loaded at the bottom by having a plate of lead or iron screwed to its outer side, sufficiently weighty not only to cause it to shut, but to keep it so. A very ingenious mode of ventilati
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
