103 



walls are also much drier. (Rendles Treatise on the 

 Tank System). 



Hot water in Tank and Pipes combined. — This has 

 been done by Mr. G. Fleming, the excellent gardener 

 at Trentham Hall. He says, in a pine pit recently 

 erected a Trentham, the tank system of bottom heat- 

 ing and that of hot water pipes for top heat are com- 

 bined ; and for keeping a sufficient and steady heat, 

 with a small consumption of fuel, nothing can be 

 more satisfactory. The pit is seventy-seven feet 

 long, and twelve feet wide inside, and is heated by 

 what is called a saddle boiler. Under the bed are 

 four tanks, into which the water is delivered from 

 the boiler by a four-inch pipe, and after pursuing its 

 course, is again received by another pipe. The ad- 

 vantage 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 regular 

 in all parts of the house. The depth of water in 

 the tanks is about three inches. The tanks are made 

 of brickwork, coated with Roman cement. They 

 are arched over with brickwork also, which is 

 cheaper than covering them 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 to keep the 

 tan in a proper state of moisture. The same boiler 



