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DESCRIPTI^j^^OF AN APPARATUS 



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jTRANSFERRING GASSES OVER WATER OR MERCURY, &c. 



,(.t .,;i) ->);,. 



■ ^ BV THE. REV. GILBERT AUSTIN, M.R.I. A. 



M Oil J ■JULtil (V ;; ■ 



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>0 gn'v) oil J ill Gt 2B O^ -TT-seessees^ 



iiinrr > Jon a fJoi read, july 4'M 803. 



JL HE difficulty of transferring gasses from one jar or re- 

 ceiver to another, without loss, or mixture of atmospheric 

 air, by the common mode in the pneumatic apparatus, 

 must have been experienced often by philosophical che- 

 mists. And this difficulty is encreased when very large 

 jars are used, and wlien the production of gas in them is 

 inconsiderable; as when oxygen gas is obtained from vege- 

 tables exposed to light, or from the decomposition of 

 water. Of the small quantity, obtained in this manner, a 

 portion is often lost in transferring it into a smaller jar for 

 the purpose of subjecting it to examination; and the result 

 of the experiment is rendered uncertain, if tlie object 

 be .to'imeasure the quantity. In order to obviate this in- 

 convenience, I beg lea;ve to submit to the Royal Irish Aca- 

 demy the description of a small apparatus, which I have 



B 2 found 



