FRA 



substitute for the green-house ; and on 

 this subject we have the following 

 statement of Mr. Crambe, of Redbraes, 

 near Edinburgh : — 



" Being deficient in accommodation 

 for heaths and pelargoniums, Mr. 

 Crambe procured two melon-frames, 

 the dimensions of which were twenty 

 feet long by eight wide ; he then built 

 walls of a few courses of bricks, in- 

 closing an area of the exact size of the* 

 frames upon which they were placed. 

 The floor was elevated sis inches above 

 the ground, level and paved with 

 bricks laid in finely-sifted coal-ashes, 



generally suffer in them for want of ^ ^^yj^g tj,e^rgyi(.eg l^gt^een them filled 



light : if the accumulation of heat was 

 required, the colour should be'black. 



Raising the Frames. — It is a well- 

 known difficulty that the gardener has, 

 in raising the frames so as to keep the 

 foliage of the plants within them at a 

 determined and constant distance from 

 the glass. To remedy this, Mr. Nairn, 



with sand, which makes a better joint- 

 ing than lime, the close joints of which 

 leave no escape for the surplus water, — 

 placing the building in a longitudinal 

 direction from east to west. As a fire- 

 flue would have occupied more space 

 than could be spared, Mr. Rogers' 

 conical boiler was adopted. The 



gardener to J. Creswell, Esq., of Bat- I bojjer is placed on the outside and is 



tersea Priory, has introduced the inge 

 iiious contrivance represented in the ac 

 companying sketch and references : — 

 A, a movable frame ; b b, inside lining 

 of the pit ; c c, outer wall. Between 

 these the sides of the frame pass, and 

 are lowered or elevated by racks and 

 spindles, d d. Fig. 53. 



Fig. 53. 



inclosed in a case of double sheet-iron, 

 with a movable cover, and funnel of the 

 same material, for the conveyance of 

 smoke into a brick-chimney, the space 

 between the case and boiler being filled 

 with sand as an excellent non-conduc- 

 tor. At right angles to the end of the 

 pit is a brick-wall about three feet 

 high, inclosing the boiler on two sides, 

 leaving an open space in front for the 

 admission of air and the clearing away 

 of ashes. A movable wooden cover, of 

 a triangular form, is placed above, to 

 protect the whole from the effects of 

 the weather. 



" The size of the boiler is eighteen 

 inches high by twelve in diameter at 

 the base, and is placed upon a cast- 

 iron grating, having a furnace-door be- 

 neath for the regulation of air. The 

 pipes, two inches and a half wide, are 

 conducted along the front and secured 

 to the wall with iron hooks, it being 

 A'morc simple plan might perhaps unnecessary to convey them round the 

 be adopted, by having frames of the back, as the apparatus is found suffi- 

 same length and breadth as the origi- cient to heat a space of double the size, 

 nal, but only from an inch to three | " For fuel he has uniformly found 

 inches, or upwards, deep. These, as coke to maintain a constant and regu- 

 necessary, might be put on the top, and lar heat : indeed this sort of boiler is 

 would be kept close by the pressure of not suited for the consumption of coal, 

 the lights; bolts and nuts might also ; although, by a little alteration of the 

 be easily applied, and the interstices i present form, it might be made to con- 

 rendered still more impervious to air i sume it as freely as coke. When the 



by being faced with list. 



external temperature was as low as 



The frame may often be made a i 20", the internal heat of the pit did not 



