228 IMPROVEMENT OP WOUtPE*S APPARATUS. 



upwards be- the tube G for example in the bottle F, by the preffure of the 

 tweenthe tubes. g as accumulated in it from the refiftance of the column of wa- 

 ter in the other bottles ; and this even proceeds fo far that 

 part of the liquor is forced out entirely. This can in fome 

 meafure be obviated by diminifhing the quantity of fluid in 

 the laft bottles, or by introducing into them little more than is 

 fufficient to immerfe the extremities of the tubes. In this 

 way however the preffure obtained, by which the abforption 

 of a gas is promoted, is very inconfiderable. The fame in- 

 convenience is prefent in the apparatus of Cit. Girard, and 

 Ttemedy, by can be obviated only in the fame mode. In the prefent ap- 

 lengthenmg the p ara t us> another improvement may be introduced, by which 

 it is more effectually removed, that of having the ftraight 

 tubes which are foldered into the bottle of a greater length. 

 This is reprefented in the drawing at K L, the open tube A 

 rifing five or fix inches above the neck of the bottle. It is 

 rather more difficult to folder in the tube in this mode, but 

 the advantage from the increafed height is fo great, that the 

 apparatus (hould perhaps always be conflructed in this 

 manner. 

 How to convert Inftead of fixing the ftraight tubes into the bottles when 

 Woulfe^Tappa- tne y are mac * e > tne y m ight afterwards be fitted in by grind- 

 ratus into the ing, and then a common Woulfe's apparatus could be eafily 

 prefent. converted into this improved one. The other mode however 



* is preferable, as we are more certain of having the apparatus 

 air tight, and it is fo eafily done that it adds little to the 

 expence. 



I am, with refpefr, 

 your's, &c. 



J. MURRAY. 



II* Objhrvfltionf 



