114 



HE VIEW. 



VIII. On the applicatiou~of the laws of heat, to determine the proper size of 

 an apparatus for heating any description of building. — Chapter IX. On pe- 

 culiar modifications of the hot-water apparatus. — Chapter X. General ap- 

 plication and summary. — Chapter XI. On ventilation. — Chapter XII. On 

 the various methods used for distributing artificial heat. — Tables, &c. 



To show the nature of the work we extract the following. 



" In making an estimate of the quantity of glass contained in any parti- 

 cular building, the extent of surface of the wood work must be carefully 

 excluded from the calculation. This is particularly necessary in buildings 

 used for horticultural purposes, where from the smallness of the panes, the 

 wood-work occupies a considerable space. The readiest way of calculating, 

 and sufficiently accurate for ordinary purposes, is to take the square surface 

 of the sashes, and then deduct one-eighth of the amount for the wood-work. 

 In the generality of horticultural buildings, the wood-work fully amounts to 

 this quantity : but in some expensively finished conservatories, &c, it is con- 

 siderably less, and therefore the allowance must be made accordingly. When 

 the frames and sashes are made of metal, the radiation of heat will be 

 quite as much from the frame as from the glass ; therefore, in such cases, 

 do deduction must be made. 



" Some loss of beat will likewise arise from imperfect fitting of doors and 

 windows. In these cases the circumstances vary very considerably; but in 

 the majority of instances, no allowance is necessary for these sources of loss 

 of heat, the external temperature of the air having been reckoned suffi- 

 ciently low to supersede the necessity of any farther deduction. 



" From the preceding calculations, the following corollary may be drawn : 

 — the quantity of air to be warmed per minute, in habitable rooms and 

 public buildings, must be 3\ cubic feet for each person the room contains, 

 and 1; cubic feet for each square foot of glass; and for conservatories, 

 forcing bouses, and other buildings of this description, the quantity of air to 

 be warmed per minute, must be 1^ cubic feet for each square foot of glass 

 which the building contains. When the quantity of air required to be 

 heated, has been thus ascertained, the length of pipe which will be neces- 

 sary, m;iy be found by the following 



" Rule:— Multiply 125 by the difference between the temperature at 

 which the room is purposed to be kept, when at its maximum, and the tem- 

 perature of the external air ; and divide this product by the difference be- 

 tween the temperature of the pipes, and the proposed temperature of the 

 room: then, the quotient thus obtained, when multiplied by the number of 

 cubic feet of air to be warmed per minute, and this product divided by 222, 

 will give the number of feet in length, of pipe 4 inches diameter, which wilt 

 produce the desired effect." 



(To be Continued.) 



The Fruit, Flower, and Kitchen Garden, being the article, 

 " Horticulture," of the seventh edition of the Encyclopoedia 

 Britanniea. By Patrick Neill, L. L. D., F. R. S. E. Secretary 

 to the Caledonian Horticultural Society. Edinburgh : Adam & 

 Charles Black, North Bridge, Booksellers to Her Majesty for 

 Scotland ; 12mo. p. p. 336. 



This work reached us so late in the month, that we can only 

 notice its publication, for the present, we will remark further in 

 our next. We would just observe, however, that the work 

 issuing from so eminent an Horticulturist as the author, is a suffi- 

 cient recommendation of it to every person fond of gardening. 



