DBCOMPOSING THE SULPHATE OP BARYTES. 16^1 



What I have further to advance on this fubje6t muft be re- 

 ferved until feme future opportunity, as it w^ould exceed the 

 limits of this paper. 



E. WALKER. 

 Lynn, May 16, 1805. 



IV. 



Nexo Method of dexompofing the Sulphate of Barytes for pre-^ 

 paring tlie Muriate of that Earth, and Preparation of the 

 Muriate, By Mr. Goettling.* 



A HE muriate of barytes is now In fuch general ufe, that Muriate of bi- 

 every improvement in the mode of preparing it muft meet a^J^^^rauchufed. 

 favourable reception. This will render the new method of 

 Mr. Goettling acceptable to the public. 



The decorapofition of fulphate of barytes by means of char- Decompofition 

 coal requires a ftrong fire continued a long time, and never ^^^^J'jP^j^^^^^"^^^^ 

 fucceeds completely. This is owing on the one hand to the coal troubkfomc 

 flrongly oxigenated quality of the acidifying principle in the ^"'^ ^"'^o"^?^^^^' 

 fulphuric acid, fo that in its trandation to the charcoal it gives 

 out but little caloric; and on the other hand to the difficulty 

 of imparling a certain degree of heat to a mixture, into which 

 a large quantity of a body that is fo bad a condu6lor of heat as 

 charcoal enters. To remedy the firft of thefe defe6ts, I hadRemediej: 

 already propofed to increafe the proportion of charcoal a-litlle, J^ "^^ ^^-^ 

 and to incorporate with the mixture of charcoal and fulphate nitrate of potaAj 

 of barytes a twentieth of nitrate of potalh; To remedy the 

 fecond, Mr. Goettling advifes to add muriate of foda to the —and muriate 

 mixture, which ferves at the fame time as a condudor of heat° 

 and a flux. The following is his method. 



Four parts of native fulphate of barytes in fme powder are Mr. Goettllng's 

 to be mixed with one part of muriate of foda and half a partP'"^"^^* 

 of charcoal powder. This mixture is to be prefled hard into barytes with 

 a Heffian crucible, and expofed for an hour and half to a red"^^'^'^^^ °^ ^°^* 

 heat in a good wind furnace. After it has grown cold, the coal are he ate4 



together. 



* Tranfl:\ted from Van Mons's Journal de Chimie, Vol. VT. 

 p. 80. Originally publifhed in the Tafcbeh-Buchfuer Scheidekueft' 

 fler. 



Vol, XL— JviY, 1805. M niafs 



