and for the RcB'ificat'ion of spirit of IJ^ine. 22J 



the convenience of the workmen, is here fliut, and the aper- 

 ture for introducing the fuel is lengthened, 



c is the tube deilined for introducing the fuel : it paflTcs 

 through the fide of the vcflTel, and can he flnit bv the door J, 

 in order to afford an uniform paffiige to the heat through the 

 draught tubes. 



It is nccellary that the tube deftincd for introducing the 

 fuel fliould have the fame heiffht and breadth as the fire- 

 place e, and it will be better that the whole furnace fliould 

 be rather fquare than round, as the fire by thefe means can 

 be better managed; and when the tube is iluU by the dooris?, 

 no unneccflary cfcape of heat, notwithftanding its width, is 

 to be apprehended. 



f is the a(h-ho]e, which is deftined not only to receive 

 the afhes that fiill from the jri'ate, but to favour the accefs of 

 the atmofpheric air neceflary for maintaining the fire. It is 

 therefore requifite that the vefTcl fliould be placed on two 

 blocks, that the air may find a palTage under the bottom. It 

 is of great importance that the lower part of the furnace be 

 well joined to the bottom of the velTcl, to guard againft the 

 fluid running out. 



From the upper part of the furnace a draught tube,^, pro- 

 ceeds alfo through the fide of the vcflel. This tube, accord- 

 ing to the fize of the apparatus, muit proje6l from it from 

 two to fix inches. Above this tube there is a fecond draught 

 tube, /j, which, by the tube i, having a right-angled knee at 

 each end, communicates wilh the tube g, while the other 

 end of it is deftined to convey off the fmoke and foul air, 

 According to the fize of the vefl'el, this tube is at the diftance 

 of from fix inches to a foot above the tube g. If it be ne- 

 ccffary that the furnace fliould be well fa'.icn'jd to the bottom 

 of the velfel, it is no lefs neceflary that tlie parts where the 

 tubes pafs through the fides of the veffel fliould be wdl joined 

 and completely water-tight, in order to prevent the fluid froni 

 oozing tlirougli. 



Around the upper edge of the vefl'el there is a copper rinf 

 from three to four inches in breadth, in order to receive the 

 copper flioulder /, which, as well as the cover, may be ren- 

 dered air-tight by means of paper or linen rags daubed over 

 O g ?. v\itU 



