212 



APPARATUS FOR DRYING 



Dr. Hope faggefted that the apparatus might be made ftiU 

 more fimple without impairing its merits, in any confiderable 

 degree, particularly when fmall volumes of gas are to be ex- 

 amined. This is done by uling a fmall bottle having one 

 neck only, and having a graduated tube nine or ten inches 

 long, and from half to three quarters of an inch in diameter, 

 accurately adjufted to fit into it, but not proje«5ling into its 

 cavity. 



If the bottle have twice or thrice the capacity of the tube, 

 the fame folution of fulphuret of lime may be repeatedly ufed, 

 and the abforption will be more expeditious. 



In employing this inftrument, the manipulation is in all 

 ,refpe6ls the fame as above defcribed, excepting when the 

 progrefs or termination of the operation is to be difcovered. 

 For (his purpofe, loofen the connexion between the tube and 

 the bottle, in a degree fufficient to allow the ingrefs of the 

 water of the trough, in which the eudiometer mufi: then be 

 imraerfed. 



This apparatus equally unites difpatch, osconomy of eudio- 

 metric liquor, and convenience of management. 



I 



IX. 



Apparatus for 

 drying precipi- 

 tates on the 

 water bath : 



DefcripHon of an Apparatus for drying the ProduSts of Chemical 

 Analj/fis ivhich is alfo iifeful for Experiments of Congelatio?i. 

 Bj/ Mr. Frederick Ac cum. Covununicated by the In' 

 xentor. 



JL HIS apparatus, Plate X. is extremely ufeful in drying 

 fuch products as abfolutely require a temperature not exceed- 

 ing 212° ; fuch as fulminating mercury, Chenevix's fulminat- 

 ing filver, and other explofive compounds. The fubftance 

 to be dried mufl: be placed in the conical glafs veflel B, and 

 when the vefTel E is filled with water up to the fide tube D ; 

 the deficcation may be performed without any rifk of ex- 

 plofion, or any further trouble, by putting the apparatus over 

 a lamp, and keeping the water in a flate of ebullition. (Sec 

 the lower drawing in perfpeSlive,) I have found it particularly 

 ufeful in the deficcation of the precipitates obtained in the 

 analyfis of minerals. It is well known that the fame mineral, 



analyfed 



