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XvII. Defct iptlon of M. DES FlGNES's improved Apparatus 

 for faturating Water, Solutions of Mineral and Vegetable 

 Alkali, bfc. Z£fc. with Carbonic Gas ; or for making artificial 

 Mineral Waters. Communicated by the Inventor. 



[With a Plate, No. IV.] 



.x\, FIG. I. a bottle or veffel in which marble, chalk, or 

 any other proper fubftance, is to be put with a little water. 

 B a bottle containing fulphuric acid, and having its neck 

 ground to fit in the firfl bottle at C, and a cock a by which 

 any quantity of the acid can be introduced to the chalk or 

 other iubftance. As the gas is extricated, it pafTes through 

 the tube D into the vcflel E, which contains the liquid to be 

 faturated : the gas by its elafticity preffes the liquor, and 

 forces it through the tube F into G. At H is a fmall hol- 

 low glafs br.ll I with a item ground to fit the mouth of the 

 veffel G, which it (huts as a valve by the preffure of the li- 

 quor, affifted with a fpiral fpring, until the water or other 

 liquid, which has been forced through the tube F into G, 

 preffes down by its weight the ball I, and returns back into 

 E. When it accumulates to a certain point in E, the valve 

 is again fhut, and it rifes through the tube F as before. 



At b is a ftopper to which hangs a fmall weight, about 

 half an ounce, which acts as a fafety valve to prevent the 

 prefTure from reaching that point which would endanger the 

 burfting of the veffels. 



The advantage which this apparatus poffeffes, is, that it not 

 only gives the fame preffure of the gas upon the furface of 

 the liquor to be impregnated, which the common machines 

 do, but, by the conftant agitation which is kept up, bv the 

 aTcent and defcent of the fluid, continually expofes a frefh 

 furface of it to its action : by which means water or other 

 liquors may be as fully faturated in two hours as they can in 

 twelve, by any apparatus in common ufe. 



I »g. i is a fettion of the valve ball I, the fpiral fpring K, 



and 



