. The book of the garden. Gardening. a a forming the ridge are kept in their place by iron bolts. The capping b is Fig. lifted and shut, by being attached by hinges to the tumbler c. This is acted upon by the levers d e. To each of these again is attached a line passing over a pulley in the upright h h, (which also supports the roof.) By pulling the right- hand line in fig. 391, the lever d is drawn towards the perpendicular, more or less according to the amount of ventilation required, and kept at the desired point by fastening the line to a stud in the upright. The levers, d e, as well
. The book of the garden. Gardening. a a forming the ridge are kept in their place by iron bolts. The capping b is Fig. lifted and shut, by being attached by hinges to the tumbler c. This is acted upon by the levers d e. To each of these again is attached a line passing over a pulley in the upright h h, (which also supports the roof.) By pulling the right- hand line in fig. 391, the lever d is drawn towards the perpendicular, more or less according to the amount of ventilation required, and kept at the desired point by fastening the line to a stud in the upright. The levers, d e, as well as all the tumblers, c in fig. 389, are acted upon at the same instant. By pulling the left-hand line, the whole action is reversed, and the capping or top of the ridge b falls close down, and ventilation is suspended. A house 60 or 80 feet long may be ventilated by this means; but, of course, if the house is longer, it will be better to divide the ventilation into two pieces. Back and front air may be given to lean-to houses on the same principle, it requiring but a very slight modification to adapt it to such circum- stances. The houses ventilated upon this principle have fixed roofs, glazed with sheet-glass 9 inches by 21, and nearly air-tight. Front ventilation is obtained in one case by means of openings in the 2 o. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McIntosh, Charles, 1794-1864. Edinburgh and London, W. Blackwood
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
