. The book of the garden. Gardening. from the boiler along the pipe a, and through the cock into b and c, returning again by e and / in the under part of the cock, and into the under part of the boiler by the main return d. When g is turned round in front of pipe b, no circulation takes place in that direction; the whole water then flows along the pipe c, and re- turns by the under part of the cock /, and into the boiler by d. When g is placed in front of c, the flow and return is there stopped, and the water flows and returns by b and e into the cock, and into the under part of the boiler by
. The book of the garden. Gardening. from the boiler along the pipe a, and through the cock into b and c, returning again by e and / in the under part of the cock, and into the under part of the boiler by the main return d. When g is turned round in front of pipe b, no circulation takes place in that direction; the whole water then flows along the pipe c, and re- turns by the under part of the cock /, and into the boiler by d. When g is placed in front of c, the flow and return is there stopped, and the water flows and returns by b and e into the cock, and into the under part of the boiler by d, as indi- cated by the arrows shown on section. And again, when g is placed in front of all connection with the cock is cut off, and the water from the boiler flows along the other set of pipes situated on the left hand of the boiler, which can, in this case, be more quickly heated if required. These cocks are made for 4-inch pipes, and are bored, turned, and ground very exactly, to prevent any heating from the different branches. They are solid in the bottom, which prevents leaking, and have a close cover ground into the outer case, and on to the top of the movable stopper. Some of these stopcocks are made to circulate along a, and return down through the stopper to the boiler by d, without going into any of the other branches. These latter have not the branches b or e. Stopcocks are both an expensive, and often an unsatisfactory part of a heating apparatus. One of the simplest substi- tutes is thus described by Tomlinson, and may be made applicable where two or more hothouses are to be heated by the same boiler, or where bottom and atmo- spheric heat is supplied from the same source: " To effect this, a small open cistern, a, should be placed on top of the boiler b, as shown at fig. 324, and from the bottom of this cistern the various Fig. flow-pipes are made to branch off. By this means," he says, "the expense of stopcocks or valves is avoided; for by
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
