for condensing Smoke, &c. 271 



equal to the expenditure through the holes in its bottom. The 

 shower, in its descent, carries down with it the smoke, and all the 

 sublimed matter which has passed from the fire, in the direction 

 pointed out by the arrows, and the whole, thus condensed, runs 

 oflF from the flue D, at the opening F. 



Although the drawing gives the lateral communication between 

 the flues B and D in the manner described, it will be obvious, on 

 reflection, that these flues may stand so close to each other as only 

 to be separated by a party wall. Or D may stand at any, and 

 almost an unlimited distance from B (which may run in any 

 direction that may be found convenient) without lessening the 

 draught of air, provided that the matters which pass through it 

 enter the flue D immediately under the cistern E, with a view to 

 make the condensation by the shower of water as complete as 

 possible. 



When it is considered, that water and air have a mutual attrac- 

 tion for each other; that all bodies expanded by heat, are contracted 

 by col4 ; and that the motion of bodies in falling, is accelerated as 

 the distance they fall through is increased, it must be evident, that 

 by a due attention to these several causes, and a proper application 

 of them, such a current of atmospheric air may be made to pass 

 through a furnace, as, perhaps, was never yet attained. 



It was not this application of the principle that first suggested 

 the idea of effecting condensation by this mode, but in seeking a 

 remedy for the baneful effects produced by arsenical and sulphu- 

 reous vapours, sublimed metals, and other matters \?hich spread so 

 widely in all directions, around those works where the smelting of 

 metals is carried on. 



Though it is hoped the public may derive advantage in various 

 ways from the application of this invention, and, more especially, 

 where the expense of carrying it into effect bears but a small pro- 

 portion to the advantages that will accrue, still it may be expected 

 that many instances will be found, in which the difficulty or the 

 expense of procuring the necessary supply of water, and possibly, 

 other causes, will operate as a total bar to its adoption. On the 



