An improved Method of heating Boilers. S 7 7 



answer the purpose intended. Having in a former number 

 «f our work given an account of this invention, we need 

 not here repeat it. We think, however, that there will be 

 no impropriety in pointing out an addition which has been 

 made to it since its first adoption, and which is a consider, 

 able improvement, namely, a method ot getting rid ot the 

 clinkers or vitniied scori-'C, invented by Mr- \V oolf . 1 his 

 contrivance, which is very eft-ectual, has at the same time 

 the merit of being extremely simple. The ccmbusuon ot 

 the fuel commences, and is chiefly carried on, on tue hori- 

 zontal part of the bars: from this the fuel is pushed back 

 from time io time to the inclined part, and at last the vi- 

 trifled portions fall from the lower end into a cavity o, the 

 bottom of which is furnished with didmg horizontal iroa 

 doors. These from tiaie to time are drawn out a ccrtaiu 

 lencrth by putting an iron hook into a hole «, m the liandlc 

 of the sliding door and drawing it outward, which dis- 

 charges the chnkers into the ash-pit. 



The contrivance ^^•e have just described is found also to 

 answer another very good purpose. These boilei's are hl.ed 

 and emptied several times a-day, and between each time_it 

 is necessary for peonle to go in and clean them out. lo 

 enable them to do so the whole of this large apparatus must 

 be reduced to a moderate temperature ; a circumstance that 

 used formerly to take a considerable portion of tune, with 

 every possible care at the same time to damp the fire, i he 

 introduction oF these sliding doors behind the bars has been 

 found to present a mean for cooling the boiler very rapidly. 

 When thev ^re all drawn out at once, while the contents 

 of the boiler are discharging, such a draft ot cold air takes 

 place through that opening as absolutety to drive down the 

 flame throu^ffh the bars, and to cool the boilers so eflectu. 

 ally, that bv'the time it is empty, which takes about twenty 

 minutes, the people are able to go instantly into it. 



To give as much room as possible about the tront ot the 

 fire-place, and at the same time to insure suflicient strength 

 to the structure of bnck-work inclosing the iurnaec and 

 boiler, which from the bottom of the ash-pit to the top ot 

 the dome of the boiler is about twenty-one teet j tnc tront 

 btands on pillars made of cast iron. 



Fig. 3. is a front view of one-half of the erection ; (that 

 is, cnouirh of it to show the front of one of the two tur- 

 naces.) "Tht? air which is admitted above the luel, to in- 

 llamc the smoke, as described in our account ot INIr. Ito- 

 berton's invention (vol. xi.), enters by the two sma.l qua- 

 drangular apertures on a line with the lower ornament ot 



