10 REMARKS ON THE ARNOTT STOVE. 



readily calcines and will soon leave the joints open. The mortar I 

 used was simply sand mixed with warm water ; not common sand, 

 hut such as is used by iron-founders in this neighbourhood for casting, 

 and called by them fire-sand ; the effect produced from this is, that 

 instead of calcining it is baked (or vitrified in some measure) by heat, 

 and becomes ultimately as hard as the 'brick. I should suppose 

 that the same material of which bricks are usually made will answer 

 every purpose. The interior, where the fire (or fuel) is placed, is of the 

 usual size of the Arnott stoves, and formed of the fire brick, that may 

 be had of most persons who sell such stoves, seven and a half inches 

 square horizontally and twelve inches deep ; at the bottom of this there 

 is a small ledge on which rests a portable cast-iron grating, to support 

 the fuel ; portable, in order that it may be readily replaced if in- 

 jured by the heat or choked with clinkers, as is frequently the case 

 on using some sorts of coal ; underneath this, of course, is the ash- 

 pit. The doors, for placing the fuel in, used for the ash-pit, situate 

 as in the patent stoves, are of cast-iron, made air-tight, with sub- 

 stantial frames having projecting arms that they may be firmly 

 walled into the brickwork. Above the space I have described for 

 the fuel, (I believe in the Arnott stove called the fire-pan,) the 

 interior is wider, say fourteen inches square, and continued up about 

 ten and a half inches, when an iron sand-groove is securely fitted and 

 a wrought iron cover rests thereon, nir-tight, in the usual way, having 

 a knob for a handle to lift it by ; and close under this sand-groove 

 is the aperture for the flue, which is of copper pipe four and a half 

 inches diameter, carried up to within about one and a half feet of the 

 glass and then passing through the wall. Although I have used 

 copper, I am of opinion that a brick-flue either extending horizontally 

 and then erect, or carried perpendicularly from the side of the 

 stove, would be preferable ; if sufficient height be given to the chimney 

 to insure draught, (an important point with slow combustion)- Over 

 this air-tight cover, there is still a space about four inches higher, 

 and then a cast-iron cover at top, fitting flatly on the brickwork, 

 which need not be air-tight. This has the effect of modulating the 

 heat that with one cover would be too intense for a greenhouse. 



So far I have adopted a plan suggested and acted upon success- 

 fully by two enterprising floriculturalists residing in a neighbouring 

 town, but with them, the air for feeding combustion being admitted 



