}Ji$ EXPERIMENTS TO PRODUCE SULPHATE OF SODA, &C. 



inches deep. Some of the liquor was expofed in butcher's 

 trays made of afh, four feet long, two feet wide, and a few 



inches deep. Thermometer, Fahrenheit, 26 : Product, 



Glauber fait, or fulphate of foda, and muriate of magnefia, in 

 quantity correfponding with the proportion of the requifites in 

 the mixture, 



Obfcxvations. Contrary to my ufual practice, the faline liquor in this ex- 



periment was put out in a cold ilate : The confequence was, 

 a precipitation of the fulphate of foda in the form and appear- 

 ance of fl. benzoin. The whole of the Glauber fait was thrown 

 down ; the mother liquor containing only muriate of magnefia. 

 While the mother liquor contains Glauber fait, it will feel and 

 appear in fome meafure harm and faline ; but when totally de- 

 prived of Glauber fait, new appearances will take place. The 

 tinned iron gutters, inflead of fhewing a difpofitioh to rufl, will 

 be remarkably clean and brilliant ; the mother liquor foft and 



Very fine cryf- oily to the touch, and will pour fmooth. To obtain the Glau- 



tah of Glauber's k er f a j t [ n cliflinct cryitals, the product of this experiment was 

 rediffolved in a leaden evaporator, in its own water of cryflal- 

 lization, and pure water added, enough to make a light faline 

 liquor. This liquor was put into leaden coolers ten feet long, 

 five feet wide, two inches deep, (landing in a room, therm. 57, 

 doors and windows were left open. In the morning I found 

 and took about three or four large baikets of Glauber falts, 

 perhaps the moil perfect cryltals ever feen ; cry dais from nine 

 to fifteen inches long, and one inch broad. 



Cryftallization To avoid the trouble and expence of diifolving the fulphate 



by fi ofl : without f f oc j a twice, while the frofl continued the operations were 

 lecond folution. . *, . . ." r r 



continued in the large way, in the proportions of lulphate 



magnefia, muriate foda, and water, as mentioned, with the 

 precaution of pumping the liquor from the pans into the 

 troughs and trays, hot, but beneath the boiling point. The 

 whole of the Glauber fait was always formed when the froft 

 was fevere, as at thermom. 23, in beautiful and diflind crys- 

 tals, half an inch broad and four or five inches long. 



PRECAUTIONS AND REMARKS. 



Various cau- Call iron pans, heated in frofly weather, frequently burft. 



tions, &o en Boilers fhould be made of flieet iron, jointed wooden veffels 



of falts. will not hold hot faline liquors. In melting falts different fteps 



mufl be adopted. Salt holding little water of cryftallization, 



' as 



