Apparatus for making Gaseous Oxide of Carlo?! . 3 1 g 



I shall here give the description of the apparatus as com- 

 Eiwnicated by the author, and exhibit a view and plau of h^ 

 which will make its parts more intelligible. (See Plate X.)' 



If gaseous oxide of carbon is wislfed to be obtained, let 

 there be first introduced into three gun barrels, B, C,and D, 

 charcoal, very dry and well cKosen'broken into small pieces. 

 By means of a thin piece of iron bring the bits of charcoal, 

 but without compressing them, to that part of the o:un bar-' 

 rels which is to be exposed to the action of the fire'. Place 

 the barrels horizontally in the furnace A, one by the side 

 of the other, leaving between each a distance of about two 

 inches ; secure them in their places with clay, and then put 

 on the dome of the furnace. This being done, into one 

 end of the barrel B insert the glass tube E, which is so 

 curved as to allow its other encrto be introduced into the 

 neck of the bottle F, which must be large enough to admit 

 also the pipe of the curved funnel G. In the other end of 

 the barrel B is inserted one extremity of the bent tube I-f; 

 tlie other end of which tube is fixed into the barrel D^ 

 making a comnmnication between D and B. In the same 

 manner, the barrel D is joined to the barrel C bv another 

 glass tube I ; and lastly, the other end of C receives the. 

 lube K, properly bent to pass under the receiver M, placed 

 on the shelf of the pneumatic trough L. 



Things being thus disposed, put"~carbonatc of lime mixed 

 with water into the bottle F; lute with care all the joininirs 

 of the tubes, and put fire into tlie furnace. When the ouu 

 barrels have acquired a red heat, pour sulphuric acid into°the 

 funnel G, which, when it passes into the bottle F, will li- 

 berate a quantity of carbonic acid e;as from the carbonate 

 t<f lime. The gas is obliged to pass through the tube E 

 and the barrel B, and by the tube H is con'veyed to the 

 barrel D, and thence by the tube I into the barrel C, and 

 through the tube K into the receiver M. The intention 

 of the process is to make the carbonic acid gas pass throui^h 

 among the pieces of ignited charcoal contained in the gmi 

 barrels, and thus to saturate itself with as nmch carbon as 

 it can take up. 



It is easy to cimccive that this is a more sure and ex- 

 peditious n)ethod than that before emplovcd, in which th*' 

 gas was made to pass only through a single barrel. It is 

 true the gas was submitted a second, and even a third 

 time, to the same operation ; but this was always attcndexl 

 with a waste of time and a loss of gas, which does not take 

 place when thi» apparatus is en)ploycd. 



LXI. M- 



