. The book of the garden. Gardening. 202 HEATING AS APPLIED IN HORTICULTURE. these partitions are apertures 12 inches in width, 2 inches in depth, and 6 inches apart, by means of which the heat and steam from the hotter parts of the tank can act regularly on the cooler—thus equalising the temperature throughout the whole of the superincumbent mate- rials. In the chamber underneath the tank are 4-inch cast-iron pipes, (g in sec- tion,) in which hot water circulates for heating the atmosphere of the pit; and in order that the water may circulate freely in these pipes, the top of the boiler shoul
. The book of the garden. Gardening. 202 HEATING AS APPLIED IN HORTICULTURE. these partitions are apertures 12 inches in width, 2 inches in depth, and 6 inches apart, by means of which the heat and steam from the hotter parts of the tank can act regularly on the cooler—thus equalising the temperature throughout the whole of the superincumbent mate- rials. In the chamber underneath the tank are 4-inch cast-iron pipes, (g in sec- tion,) in which hot water circulates for heating the atmosphere of the pit; and in order that the water may circulate freely in these pipes, the top of the boiler should be placed on a level with them. These pipes, as well as those that lead to the tank, are furnished with valves of a sim- ple construction, by which the flow of water can be regulated as circumstances may ; Mr Mitchell's " reason for placing the pipes underneath the tank is, first, because it saves room; and, second, because in this way the whole atmo- sphere of the pit is kept in constant cir- culation, whereby ventilation is in a great measure superseded during the short days of winter, when cold renders the admis- sion of air ; The beds are prepared by laying 3 inches of drainage over the tank covers at e e; and the trellis- ing is made in convenient pieces, so that it may be taken out or put in with perfect ease. The hot-water pipes being placed under the tanks admits of the whole being wrought with one boiler, which could not be done, unless the siphon principle were adopted, were the pipes brought up to the level of the top of the bed. External air should be admitted into the vault under the tanks, which would increase the circulation, and drive the heated air out of the vault by the two openings between the tank and bed and the side walls. This is altogether a very excellent pit. Glendinning's mode of tank-heating.— Mr Glendinning has shown, in a series of sensible papers on heating and ventila- tion, (published in "Gardeners' C
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
