THE TANK MODE OF HEATING. 



203 



tion, and find that since that time 

 Mr F. has published a description of 

 it in "The Gardeners' Chronicle," from 

 which source our figures are taken. " Un- 

 der the bed are four tanks a a a a, into 

 which the water is delivered from the 

 boiler by a 4-inch pipe b b, (fig. 263,) 

 Fig. 263. 



and, after pursuing the course indicated 

 by the arrows, is again received by 

 another pipe, the end of which is shown 

 at c. The advantage of two deliveries is, 

 that the water, not having so far to go, 

 does not get so cold before it is returned 

 to the boiler, and the heat is more regu- 

 lar in all parts of the house. The depth 

 of water in the tanks is about 3 inches. 

 The tanks are made of brickwork, coated 

 with Roman cement. They are arched 

 over with brickwork also, which we find 

 cheaper than covering with slates; and, 

 by leaving interstices between the bricks 

 of which the arch is composed, the steam 

 is allowed to escape, and, penetrating the 

 stratum of rubble above, keeps the tan 

 in a proper state of moisture. The same 

 boiler also supplies a range of 4-inch 

 pipes, which goes round the pit, as shown 



at e in the section. There are cavities in 

 the wall to permit the steam from below 

 Fig. 264. 



to pass to the top of the pit. The aper- 

 ture to these can be closed at pleasure, 

 thus insuring a perfect command over 

 the moisture of the atmosphere, g, fig. 

 264, is a chamber which formerly con- 

 tained a flue belonging to the house that 

 occupied the place of the one I am now 

 describing. This chamber has been left 

 with the view of its being useful for fill- 

 ing with hot dung, either for the purpose 

 of assisting to maintain the heat of the 

 house, or for destroying insects. The 

 tanks and pipes cannot both be wrought 

 at the same time," on account of the 

 difference of level, " but they are fitted 

 with stopcocks, as that either can be 

 wrought at pleasure ; and a few hours 

 in the middle of the day, when the pipes 

 are not wanted, is found amply sufficient 

 to keep up the bottom heat, as the mass 

 of material, when once heated, retains its 

 heat for a considerable time." The use 

 of dung lining at g is, we think, quite 

 superfluous; nor can we see how four 

 brick arches can be constructed cheaper 

 than a covering of slate or pavement. 

 Hat/croft's mode of tank-heating. — The fol- 



Fig. 265. 



lowing diagrams (figs. 265, 266, 267) of a Haycroft as the details of a house he 

 pine-stove were communicated by Mr erected for Lord Doneraile : a, in fig. 265, 



