ELEVATION OF A CONSERVATORY. 



235 



to them, as at e, for the purpose of training creeping plants to them. 

 The back and front walks, e e, are four feet nine inches broad, and the 

 centre, or principal one, c, six feet and a half. These walks are covered 

 with an arched roof, formed of double plates of roUed iron,///, between 

 which is left a space of two inches, which confines a stratum of air, to 

 prevent the escape of heat, or the admission of cold. Over these plates 

 is placed an iron grating for a safe walk, to enable the operatives to repair 

 the glass, give air, &c. This house was heated in a peculiar manner by 

 Mr. Sylvester, either steam or hot water being applicable to that purpose ; 

 the pipes being placed under the walks, as at ^ 5 I, and the ca\4ty a a 

 served as a resei-voir for containing heated air, which was admitted into 

 the house as required. 



In regard to form and size, very much ought to be left to the taste of 

 the owner ; we would only here remark, that all curvilinear shapes, par- 

 ticularly roofs, are objectionable, on account of the great extra expense 

 in their erection, and the difficulty of ventilating them thoroughly. 



The annexed elevation, sections, and ground-plan represent what we 

 consider to be another very good model of a Conservator)^, upon a differ- 

 ent principle ; and as such a house really exists, and has been found to 

 answer every purpose intended, we therefore offer it with the greater 

 confidence. 



,9 .... ^ ^ 3o_ 



The length of this house is forty feet, eighteen feet wide, and eighteen 

 high. The ground plan shows it as heated by two furnaces, one placed at 

 each end of the back part; the flues, which are under the floor, pass towards 

 the front, and parallel to it, until they meet in the middle of the house, 



