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LXII. Upon a new mode of applying Hot-water to heating 

 Stoves, 8fc In a Letter to the Secretary. By Alexander 

 Cruik shanks, Esq. C. M. H. S. 



Read May 20, 1834. 



My DEAR Sir, London, May 12, 1834. 



I send you the sketch I promised you of the hot-water apparatus, 

 and two other sketches with plans for similar apparatus on a larger 

 scale, in which the parts are differently proportioned and arranged. 

 I believe I mentioned to you that I suggested this mode of heating 

 the water to a friend in France, who had built a small green-house 

 in front of his dining-room, where there was no convenient place to 

 erect the brick-work for a common boiler, nor any chimney into 

 which a flue might be turned. It occurred to me that by having a 

 small cylindrical boiler constructed like those originally employed 

 in the high pressure steam-engine, containing the furnace in a smaller 

 cylinder within the first, and surrounded by the water, that no brick- 

 work would be required ; and that by burning a mixture of charcoal 

 and cinders, the inconvenience of smoke would be avoided, and suf- 

 ficient draught obtained by a moderate length of stove-pipe passing 

 through the roof. This plan was adopted, and answered com- 

 pletely. The apparatus is represented in sketch No. 1., the same 

 letters referring to the several parts in the different figures. The 

 spaces occupied by the water are tinted blue. 



Fig. 4 is a vertical longitudinal section : A B C D, the outer 

 cylinder or boiler, 3 feet long, and 1 foot in diameter ; E the fire- 

 place ; F the door, lined with a mixture of fire-clay and pumice- 

 stone ; G the ash-pit, furnished with a drawer of sheet-iron. The 

 fire-place and ash-pit are contained in the inner cylinder, which is 



