. The book of the garden. Gardening. VENTILATION. 297 participate in the heat thus given off from the pipes to the extent intended or sup- Fig. posed. This is accounted for by the greater density of the air ; and from this fact, also, it is likely to remain stationary, because the means usually employed to heat or cool the house cannot, from the arrangement in most cases adopted, drive it from its position. Nothing can be more certain than that plants, in such buildings where the heating and cooling powers are so applied, must suffer considerably. Now, the point we have arrived at is to
. The book of the garden. Gardening. VENTILATION. 297 participate in the heat thus given off from the pipes to the extent intended or sup- Fig. posed. This is accounted for by the greater density of the air ; and from this fact, also, it is likely to remain stationary, because the means usually employed to heat or cool the house cannot, from the arrangement in most cases adopted, drive it from its position. Nothing can be more certain than that plants, in such buildings where the heating and cooling powers are so applied, must suffer considerably. Now, the point we have arrived at is to change the position of the cold air, constantly and rapidly, either by the admission of external air in hot weather, or by some other contrivances, so as to mingle with promptitute and certainty the cold and hot air within the building. This can certainly be accomplished, because of the unequal gravity of the enclosed atmo- sphere in different parts of the house, provided means are introduced by which one of the simplest laws of nature will come into fall and active operation. " In the annexed woodcut (fig. 400) the coldest part of the house is at a, and, of course, the air is heaviest at that place. A drain, therefore, communicating with b b, will at once set the atmosphere in motion in the direction indicated by the arrows, provided an artificial temperature be kept up by means of the heating apparatus. Dur- ing summer, when artificial heat is unne- cessary, I would open valves having com- munications to them from these air-tunnels at cc, to admit the external air, which would invert the direction of the current, as is now shown. An impulse would thus be given, not only in winter, but in summer also, by the colder air to the hotter, thus keeping the atmosphere constantly excited and in motion, besides equalising the tem- perature throughout the entire ; The following remarks on ventilation, VOL. I. by Mr Errington, a very sensible writer in "The Garden
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
