. The book of the garden. Gardening. CONSTRUCTION OF GARDEN WALLS. 83 height, two catches, a a, at each end, will fly out by means of weight at their tails, as shown at a; and these will hold the gauge-box in its proper station till it may require again to be ; It will readily be seen that, by the use of this box, the vacuities will be perpendicular; whereas, by using planks in the way described above, they will be horizontal, and calcu- lated for the circulation of heat by either of the means proposed, which the perpen- dicular vacuities would not admit of. The great advantage of
. The book of the garden. Gardening. CONSTRUCTION OF GARDEN WALLS. 83 height, two catches, a a, at each end, will fly out by means of weight at their tails, as shown at a; and these will hold the gauge-box in its proper station till it may require again to be ; It will readily be seen that, by the use of this box, the vacuities will be perpendicular; whereas, by using planks in the way described above, they will be horizontal, and calcu- lated for the circulation of heat by either of the means proposed, which the perpen- dicular vacuities would not admit of. The great advantage of hollow stonewalls is to resist damp, and hence they are well adapted for dwelling-houses. Stone walls, built sufficiently thick to admit of the interior being filled up with loose stones without mortar, are warmer than solid ones of the usual size, parti- cularly in the case of walls having a southern aspect; because the heated air from the sun, passing through the south side, is retained amongst the loose stones, and prevented from passing through the north or cold side by conduction—the cold side having a tendency to abstract the heat from the south or warmer side. Hence all south walls, of whatever material, should be of greater thickness than those facing the east or west, if it is wished that the greatest amount of heat should act on the south side ; because, from the much greater cold on the north side, it is continually abstracting heat from the warmer side opposite to it. Walls with east and west exposures are more uniform in tempera- ture on both sides, as they are not subject to the same rule—they receive heat equally, and part with it equally. SilverlocF s hollow brick wall.—This wall is the invention of Mr Silverlock, a re- spectable nurseryman at Chichester, and has been extensively used both for gar- den walls and dwelling-houses. " It is constructed of bricks set on edge, each course or layer consisting of an alternate series of two bricks placed edgew
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
