^ 



Bavarian me- 

 th<>d of evapo- 

 rating fait 

 yraters* 



Sconomy of 

 fuel. 



JirViAPOR^l^IpN af SALT WATER Si 



boiling, it rs completely fioncentrated, and depofils aJl its fuf- 

 phate of lime ; it is then paiTed into the cryftallizing pans, 

 ftill lower than thofe of preparation, and placed at the two ex- 

 treniitle3 of Ihe froiit row:: there the water fcarcely boils, and 

 the fait cryftallizes. 



Each pan, with the exception of the fmall pan, has a par- 

 ticular fire-place, the chininies of which pafs round the fides 

 of the pan : they unite undfer the fmall pan, by which meants 

 there is little heat loft, 



Thefe pans are placed two and two in chambers of tvood, 

 the joinings of which are well feeured, which clofe them 

 hermetically: thefe chambers €re low, and their ceilings are 

 perforated in the middle with holes terminating in a tube, by 

 means of which the aqueoirs vapour is difengaged with rapi- 

 dity. The chambers for the preparing and cryftallizing pans 

 have their ceiling pyramidal, or in the form of a reverfe hop- 

 per, while that for the fmall pan and the graduating pan is 

 horizontal. 



The faline waters are pafled fucceffively into thefe foar 

 kit\ds of .pans.,; the workmen penetrate into the chambers, in 

 the mrdft of the vapour, to open the communications. This 

 operation is performed every lix hours, and the water in each 

 pan is reftored to the level at which it ftood fix hours before. 

 Every three hours the fait in the cryftallizing pans is colleded, 

 it is brought with fcoops to elevations on the front edge of the 

 cryftallizing pans, where it drains; it is afterwards carried 

 into drying rooms, which furround the oulfide of the chambers : 

 thefe are fpaces covered with iron plates; they are warmed 

 by heat-tubes leading from the fire-places. 



Every eight days tkey take away the fulphate of h'me, 

 throw out the mother-waters, and break the fliell, that is to 

 fay, the incruftations of fait which adhere to the bottoms ©f 

 the pans : every twenty-four days the work is entirely flopped 

 to repair the pans ; an operation which is performed by the 

 workmen themfelves. 



It has been found that this method of evaporation affords 

 a faving of more than one*third of the fuel. 



An .improvement has lately been made in this procefs at 

 Dieufe : the fmall pan has been fupprefled, and the drying 

 rooms have been replaced by auxiliary pans, in which a coarfe 

 fall is made* 



The 



