Ijl 



DESCRIPTION of an APPARATUS for IMPREGNATING 

 WATER ^K.-Zo/i/fr SUBSTANCES 7?roK§-/j -with CARBONIC 

 ACID GAS. By the Rev. GILBERT AUSTIN, M. R. I. Al 



HE carbonic acid gas, or other gas, is generated in phials R^d f^'f""- 



i6th, i7y9. , ^ 

 (a^ a) with bent tubes in the ufual manner, and received in 



the jar (b ) placed on the fhelf o£ the pneumatic tub. When 



the jar ( b ) '\% filled, the phials are applied to others, which are 



filled alfo, and referved to replenifh the jar ( b ). To this jar it 



may be convenient to fit the flop cock ( d ) communicating with 



the bent tube ( e )., or the bent tube ( e ) may be ufed without: 



the flop cock, and be fitted immediately into the neck of the jar. 



At the end ( f ) of the bent tube is a valve opening into the 



tube ( g )., and at the oppofite end of the tube ('^J is another 



valve ( h ) opening into the liop cock (i ), which communicates 



with the ftrong glafs veflel f/, m). To the tube ( g ) is adapted 



the condenfing fyringe ( k )^ which is placed between the valves 



(fdsvAb). The tube (g) is firmly fixed to the ftand (^« J. fo 



that the condenfing fyringe may be wo ked without diiiurbing 



the apparatus : all the joints muft be well fitted and perfedly 



air-tight. 



R 2 Taa . 



