STO 



564 



-♦ 



STO 



house to be ventikted, will be found commonly surrounded by a tbin brick 

 Tn Mr Hood's following table of the wall : but planks of stone or plates of 

 quant y of air, in cubic feet, discharged slate or cast-.ron, are to be preferred, 

 ner mLte hrough a ventilator, of The roof, when necessary, may be sup- 

 per minuie, uirouf,!! <t ^nrtcrl hv iron columns from the middle 



which the area is one square foot. 



ported by iron columns from the middle 

 of the pit, a. 



" Shelves may be placed against the 

 back wall, b, and occasionally a nar- 

 row-leaved creeper run up the roof, c. 

 We may add, that houses of this de- 

 scription are generally placed east and 

 west acainst walls, on account of the 

 shelter^thereby obtained during winter, 

 when a high degree of heat is kept up 

 within, while the cold is excessive with- 

 out." — Enc. of Gard. 



But the tank system is far superior to 

 the foregoing; and the following de- 

 tail, given by the Rev. John Huyshe, is 

 so full of information upon the point, 

 that I extract it entire from the Gar- 

 dener^ s Chronicle: — 



The foregoing table shows the dis- 

 charge, through a ventilator of any 

 height, and for any difference of tempe- 

 rature. Thus, suppose the height of 

 the ventilator from the floor of the room 

 to the extreme point of discharge to be 

 thirty feet, and the difference between 

 the temperature of the room and of the 

 external air to be 15°, then the dis- 

 charge through a ventilator one foot 

 square, will be 347 cubic feet per mi- 

 nute. If the height be forty feet, and 

 the difference of temperature 20°, then 

 the discharge will be 465 cubic feet per 

 minute. 



Bark or Moist Stove. — Mr. Loudon 

 gives the following design and descrip- 

 tion of a moist stove, warmed on the 

 old plan of deriving heat by the com- 

 bined agency of bark and flues. In- 

 stead of a stage in the centre it has 



"A is the boiler, its top level with 



the floor of the house, the fireplace 



being in a back shed. The boiler is 



small and conical; b 1 and b 2 are the 



_ tanks; is a trap-door opening into the 



stead of a stage in the centre it has ^^^j ^^ ^jl ^|^g j^^^gg ^^jt^ gjgam at 



a pit, which may be from two and a halt i^^^^^ ^^^ arrows indicate the 



to four feet deep, according as bark or 

 leaves are to be used, the latter mate- 

 rial requiring the greatest depth. It is 



Fig. 160. 



pleasure. The arrows indicate the 

 course of the water through the tanks 

 and pipes. The two pipes, though 

 drawn side by side, are really one 

 above the other; the return pipe being, 

 of course, the lower. Above these 

 pipes is a stone shelf. Tank b 1 is 



,made of oak ; the other, b 2, of elm. 



I The wood of each is two inches and a 

 half in thickness; and they stand on 



I oak blocks, three inches thick, to raise 

 them from the floor. This tends to 



; prevent their decay, and promotes a 

 freer circulation of'hot air. The bot- 



i torn boards are placed the lengthway 



