Prof. Hare's improved Eudiometrical Apparatus. 185 



the place to which the thermometrical liquid reaches before 

 the ignition of the phosphorus, and of course enables him, by 

 awaiting its return to the same position, to know when the heat 

 arising from the combustion has escaped so as to permit the 

 bulk of the residual air to be fairly measured. 



• 



Of the Carbonicometer Or Gasilotor ; 



An Apparatus for withdrawing a known Portion of residual 

 Gas from the Receiver of the Barometer-Gauge Eudiometer, 

 in order to cause the Absorption of Carbonic Acid by Agitation 

 with Lime-water. 



A mixture of oxygen with carbonic oxide, or carburetted 

 hydrogen, may be exploded in the barometer-gauge eudiome- 

 ter. Any ensuing deficit will be seen bv the effect upon the 

 gauge. 



The quantity of carbonic acid 

 produced, may be ascertained by 

 means of the instrument described 

 in the following article. 



p is a pipe which causes a com- 

 munication between the upper part 

 of the receiver R, and the cavity 

 under the hollow pedestal B. The 

 lower orifice of this pipe, where it 

 enters the cavity of the pedestal, 

 is covered by a valve opening 

 downwards. The receiver is sur- 

 mounted by a brass cap, into which, 

 as well as into the socket in the 

 pedestal, it is cemented air-tight. 

 In the axis of the receiver, and 

 descending nearly to the bottom, 

 may be seen a tube, which is sol- 

 dered into a perforation communi- 

 cating with the bore of the cock 

 C, so as to establish a communi- 

 cation between the receiver and 

 the globe G. 



The globe is surmounted by a 

 valve-cock V, furnished with a 

 gallows and screw, so that a leaden 

 pipe D, terminated by a brass knob 

 duly perforated, may be joined to 

 it, air-tight, without difficulty. Hence if the pipe be annexed 

 at the other end to the cock of the barometer-gauge eudio- 



New Series. Vol.4. No. 21. Sept. 1828. 2B meter, 



