Defcription of a netv Furnace. 65 



dyeing. Dyers, however, may reft affiired that the colour 

 which they wiih for will be more conftant the oftener the 

 cloths tf) be dved are dipped in oil, or are boiled in pure 

 liibtle oil, and then dried. 



XI. Defcription of a nciv Furnace for confuming its oivn 

 Smoke, and Javing Fuel : invented by Mejfrs. RoB erton, 

 of Glafgoiu. 



T< 



O conftruft furnaces on f'.ich a principle as fliould en- 

 able them to confume their own fnioke, has long been a de- 

 fidcratum ; and we believe the pubhc in treneral, but efpe- 

 cially thofe who have been annoyed 'n' the fmoke of fteam 

 engines, foiinderios, and fimilar erections in their neighbour- 

 liood, will be sjlad to learn that a furnace has been contrived 

 which efi'et'-iiiallv gains this end. 



The conllrudtion is extremelv fimple, and will be eafily 

 iinderflood bv the following defcription, and the plate to 

 which it refers. 



Fig. 1. (Plate i.) reprefents a vertical feftion, and fig. 2. 

 a front view of a Itcani-engine boiler, furniflied with one of 

 Meifrs. Kobenon's furnaces ; and the fame letters refer in 

 both to the fame parts of the conllruftion. 



The opening A, through which the fuel is introduced into 

 the furnace, is fhap.cd fomewhat like a hopper, and is made 

 of caft iron built into the brickwork H,fL From the mouth 

 it inclines downward to the place where the fire rcfts on the 

 bottom grate B. The coals in this mouth-piece or hopper 

 anfwer the purpofe of a door % and thofe tliat are lowcft are 

 by this means brought into a ftate of ignition before they are 

 forced into the furnace. Below the lower plate of the hopper 

 K, e the furnace is provided with front bars Gf, which 

 not only ferve to admit air among the fuel, but oifer a ready 

 way to force the fuel back, from time to time, from c to d |, 



In the man;ij;«.ment of this furnace, wliar is cliieflv ro i'e Htteiided to 

 is, tliat the honjKf be l<cpt f; II of coal, and either wholly or in part fniall 

 coal, to p' event, as much as nodlble, air gertini; in hy th:-.t p.ifl"it;e : it is alio 

 )ieccii>irv at foiT.e rimes to uic a fii'Jttcr of tl.in pl'.re-irosi, to Iv,- ppplied to 

 the mouth of the hopper to excliuie the enirauce of air by that paifige. 



t 1 hcfc bars arc, in faft, a sjra'-cd door, kept in their pofitioii by a 

 catch L, and which may be opened at (ileafure fur cleaning the fire out. 

 In fm.t I funuces an opening iiere is all that is ncctffaiy : the bars may be 

 dilpenfcd with. 



+ Hetwecn the l)ack end, c/, of the bottom bars, and the brcaft brich- 

 tiork /j, is r< prcfcntcd in tlie pl.uc a fcdtion of -i ftimiei, wh^h is I'tiire- 

 tiiiii-<. 'ipent'l ff;r tiie purpofe ot' gcttinj^ out the retufc of iht fucL 



Vol.. XI. E to 



