of a Condenser and Air-pump, 143 



(/) The pneumatic trough placed on a stool under the 

 receiver. 



(^ ) A retort, in which the gas is generated as usual. 



{hh) Two pieces of mahogany, touching the sides of the 

 barrel, and in their length fitting between its rings, so as 

 when raised or depressed, to move the barrel without shake, 

 and supporting the platform (/) with its bridge, as seen at 

 large, fig. 4. These pieces are held together by iron clamps 

 hollowed, so as to admit the barrel freely, fig. 2, k: they are 

 clamped behind in the same manner, and then the barrel is 

 secured by wedges in its proper situation, so as to be fixed 

 perfectly parallel to the iron sliding bar. From the clamps 

 behind proceed two strong arms (^^), fixed at right angles 

 in the sliding bar (/), which moves equably in the long 

 brass dove- tailed groove {m). This dove-tailed groove is 

 screwed to the strong upright pillar (0). By means of the 

 handle («), which is fastened to the sliding bar between the 

 two strong arms {kk)y the barrel, with its apparatus, the 

 platform (/), the brass bridge confining the upper vessel [a), 

 by the piece (6), are alternately raised and depressed. In this 

 action, the barrel moves upon the fixed hollow piston [d). 

 The gas is extracted from the receiver at every ascending 

 stroke, and passing through the hollov/ glass piston [d] above 

 its valve, which opens upwards, is forced at every descending 

 stroke llirough tlie valve between (j and 6) into the upper 

 vessel containing the liquor to be impregnated. Should more 

 gas be forced into the vessel than the liquid readily absorbs, the 

 safety valve at the top (seen at large, fig. 5) allows it to e cape. 

 Fig. 5, (PI. XIV.) is an enlarged view of the mouth of the 

 upper vessel (j), with the collar (6) on its neck, hollowed 



