» Defcrlptlon of a new Furnace. 67 



Under the grates is the adi-hole I, the upper part of which 

 is furniOied with doors S S, which, when fhut, prevent the 

 heat from the front bars G from coming out into the apart- 

 ment, and incommoding the workmen 



Invited by an udvertifenRnit, we went to Meflrs. Bunnell 

 and Silver, Bedford llreet, Covcnt Garden, to fee one of 

 tliefe furnaces at work, and wc were not a little gratified in 

 obferving that the fmalleft appearance of fmoke could not be 

 perceived iffuing from the top of the chimney. The advan- 

 tages of fuch an improvement can hardly be better illulhated 

 than by mentioning what had artuallv happened with this 

 fteam-engine. The fuioko, before the improved furnace was 

 employed, incommoded the neighbourhood lo much, that it 

 was flopped as an intokrabic nuifince. Now it ij fo far 

 from diilurbing any one, that, without being acimitted to fee 

 the cntrine, it would be a6lually impoffible to know when it 

 is at work. 



' Thefe furnaces, we underftand, have alfo been adopted by 

 many intelligent mannfafturcrs at Leeds and at Manchcfter. 

 At the latter place, if we mav credit newspaper reports, fe- 

 veral manufaclurers have had their works indidled as nui- 

 fances for not having adopted the improvement ; the magi- 

 flrates arguing, that, though the welfare of the place re^^uired 

 that fucli inconveniences Ihould be fubmitttd to while no 

 poffibie cure for ihcm was known, the health and comfort of 

 the inhaliitants equally demand, now that the evil can be 

 done away, thai fmoking furnaces fliould not be permitted in 

 the place. 



We earneftlv recommend to owners of fleam-engines, and 

 alfo to thofe who are annoyed by tliem, to endeavour to brincr 

 this iujprovement into general ufe. Indeed, we entertain no 

 doul)t of its being uuiverfally adopted fooner or later; for it 

 yields advantages not only in point of cleanlinefs, comfort, 

 and health, bui alfo in \v)\vXo'i irdcrejl — all thf fmoke ufually 

 difcharged at the top of the chimnev, beino-, in faft, fo much 

 good fuel, that only wanted the conlaft of frcdi air 10 inHame 

 It under the boiler. It is a faft well known, that the (lame 

 which is often feen iffuing from the chimneys of founders, 

 &c. has no exillence except at the fop of the chinmev: while 

 afcending the flue it is only denfe Ihi^^ke, confutia-- of the 

 azote of the atmofpheric air decomiiofed in palling through 

 the fire, (jf hydrogen, coal t;ir, an I carhonateous matter, of 

 fuch a hlirh tenijierature, that it only wants oxygen to make 

 it inflame fpontaneoufly: this it ol>tains fr mi the atmofpheric 

 air into which 11 alcends, and then prefents fuch ippeir- 

 anccs as would make a hally obferver adopt the opinion that 



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