105 



and which passes underground into a hot chamber, 

 covered with wood, on which the pine bed lies. B is 

 a smooth flue, passing along the front from the fire- 

 place at one end of the pit, and discharging itself at 

 the other end into an upright chimney. The shaded 

 line right and left of the section shows the ground 

 line ; so that a large part of this pit is sunk into the 

 ground. The other parts of the plan, which is drawn 

 to a scale, speak for themselves. (Gard. Chron. 

 1843, 772.) 



Hot Water in Tanks. — The boiler and apparatus 

 for this are thus described in our former volume on 

 the " Grape Vine :"— 



" Hot water in a tank is superior to the same source 

 of heat in pipes, because it is not liable to freeze ; and 

 it is preferable to steam, because its heating power 

 continues until the whole mass of water is cooled 

 down to the temperature of the house, whereas steam 

 ceases to be generated as a source of heat the moment 

 the temperature falls below 212 degs. 



" Mr. Rendle, nurseryman, Plymouth, the first 

 successful suggester of the tank system of heating, 

 has furnished us with the following particulars : — A 

 tank of iron or wood, twenty feet long, five feet broad 

 and six inches deep, is constructed in the centre 

 of the house, and surrounded by a walk, except at 

 the end, where the boiler is fixed for heating it. The 



