. The book of the garden. Gardening. i Fig. be better, perhaps, to expose all the pipes to the plants by placing them thus, (fig. 334,) provided the height of the shelves and other circum- stances permitted this mode of arrangement. In this way a larger portion of the heat would arrive at the plants in a radiant form, because on the other plan the oppos- ing surfaces of the adjacent pipes main- tain a mutual inter- change of radiation, and become cooler principally by the contact of the air. This objection applies in some degree to the in- ner sides of all pipes which are presented to th
. The book of the garden. Gardening. i Fig. be better, perhaps, to expose all the pipes to the plants by placing them thus, (fig. 334,) provided the height of the shelves and other circum- stances permitted this mode of arrangement. In this way a larger portion of the heat would arrive at the plants in a radiant form, because on the other plan the oppos- ing surfaces of the adjacent pipes main- tain a mutual inter- change of radiation, and become cooler principally by the contact of the air. This objection applies in some degree to the in- ner sides of all pipes which are presented to the wall, and from which, therefore, the heat is conveyed to a large extent by the atmosphere. Economy would, doubtless, be consulted by closing up all those por- tions of surface which are not adapted to radiate directly upon the plants or upon the soil. The same effect would be pro- duced by clothing the inner semi-circum- ferences of wall pipes with non-conduc- ting materials, or, if practicable, by giving to those portions a bright metallic ; Glass tubes were used in the Royal Gardens at Vienna so early as 1836, the tubes being about 3 inches in diameter, and in 3-feet lengths. The glass was quite transparent, and about a quarter of an inch in thickness, jointed by bands of brass and cement. Iron pipes enamelled with glass, both inside and out, are now common for con- veying water for domestic purposes. Were we certain that the expansion of the metal when heated would not throw off this glass coating, then we would say that perfection had at last been reached in the construction of hot-water pipes. The recent invention of covering iron with other metals not subject to corrosion, by chemical means, may also open up a new era in this department of hothouse archi- tecture. It appears to be the fate of all newly- invented improvements to meet with op- position by that class of individuals who are content to remain stationary, and 2i. Please note that these images are
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
