Archive image from page 557 of A dictionary of modern gardening. A dictionary of modern gardening . dictionaryofmode00john Year: 1847 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 , 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. Difference between temperature of room and exte
Archive image from page 557 of A dictionary of modern gardening. A dictionary of modern gardening . dictionaryofmode00john Year: 1847 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 , 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. Difference between temperature of room and external air. 5° 10° 15° 20° 25° 30° in 116 164 200 235 260 284 15 142 202 245 284 318 348 9,0 164 2321 285 330 368 404 95 184 260 318 368 410 450 30 201, 284 347 403 450 493 35 218 306 376 436 486 521 1 40 235 329 403 465 518 570 45 248 348 427 493 551, 60o 50 260 367 450 518 579 635 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 shelterthereby 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 diffe
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