. An encyclopædia of gardening; comprising the theory and practice of horticulture, floriculture, arboriculture, and landscape-gardening, including all the latest improvements; a general history of gardening in all countries; and a statistical view of its present state, with suggestions for its future progress, in the British Isles. Gardening. Book III. STEAM BOILERS AND TUBES. 327 too wide, or do not ascend from the furnace to the chimney ; steam is impelled from the boiler and will proceed with equal rapidity along small tubes or large ones, and descend- ing or ascending. Finally, with steam
. An encyclopædia of gardening; comprising the theory and practice of horticulture, floriculture, arboriculture, and landscape-gardening, including all the latest improvements; a general history of gardening in all countries; and a statistical view of its present state, with suggestions for its future progress, in the British Isles. Gardening. Book III. STEAM BOILERS AND TUBES. 327 too wide, or do not ascend from the furnace to the chimney ; steam is impelled from the boiler and will proceed with equal rapidity along small tubes or large ones, and descend- ing or ascending. Finally, with steam, insects may be effectually kept under in hot-houses, with the greatest ease, by merely keeping the atmosphere of the house charged with vapor from the tubes for several hours at a time. 1666. The disadvantages of steam as a vehicle for conveying heat to hot-houses are few. On a small scale it is more expensive than the mode by flues, and more trouble is required to attend to one boiler than to one or even two or three furnaces. These are all the dis- advantages we know of. It has been stated by some that steam draws up or etiolates bo- tanic plants, and lessens the flavor of fruits ; but we are inclined to consider such effects, when attendant on plants or fruits in houses heated by steam, as resulting from some de- ficiency of management in other points of culture. 1667. The boilers used to generate steam are formed of cast or wrought iron, or copper, and of different shapes. Wrought-iron and an oblong form are generally preferred at present, and the smoke-consuming furnace most approved is that of Parkes. 1668. The tubes used for conveying steam are formed of the same metals as the boilers; but cast-iron is now generally used. Earthen or stone ware tubes have been tried ; but it is extremely difficult to prevent the steam from escaping at their junctions. The tubes are laid along or around the house or chamber to be heated, much in the same manner as flues, only less impor
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Keywords: ., bookcentury1800, bookpublisherlondonprinte, booksubjectgardening
