1-0 Accoitvt of a new Eiirliomcler. 



The meanirc is filled with the air or gas, over merciuy, 

 ill the usual maimer, atul the elastic bottle is charged with 

 the soKiliou intended to be employed as the re-agent ; the 

 orifice of the stopper is then inserted into the mouth of the 

 measure in the mercury, and pressed home to its place. 



The bottle and measure being thus united, are to be firmit 

 held at the joint. Upon pressing the former, a portion of 

 the fluid is injected into tlie latter, and the gas sutlers a de- 

 gree of com; 'rcssion, bv which the action of the affinity be- 

 tween it and the ihiid is accelerated. On taking ofl'the pres- 

 sure, the bottle, bv its elasticity, endeavours to obtain its 

 original form, and receives back the fluid. This process 

 t-liould be continued as long as any absorption is observed 

 to lake place; When absorption ceases, the bottle is to be 

 separated from the measure under mercury, and the quick- 

 silver whi'jh remains in the measure being brought to the 

 level of that- in the cistern, the quantity of absorption is 

 then to be determined, which is done as follows : 



Suppose atmospheric air has been the subject of the ex- 

 periment, and consequcntlv a large residuum left; first note 

 the hundred pnrts, and then to obtain a knowledge of the 

 fractional parts, reniove the measure into the small cistern 

 in which the graduated tube filled with mercury is placed : 

 slide the tube above the surface of the fluid in the measure, 

 and, opening the stop-cock, suffer the mercury to descend 

 t;!! it ha:^ drawn the fluid in the measure to a regular divi- 

 sion ; then stop the cock, and register the hundred parts on 

 the measure, and the thousand parts on the graduated tube; 

 flic united quantities give the sum of the residual gas. Ob- 

 serve well in reiristering the thousand parts, that the fluids 

 arc exacllv on a level on the outside and inside of the mea- 

 sure; this may be easily eftected by pouring out a portion 

 of the liquid of the small cistern, or adding thereto.- 



If instead of atmospheric air, a gas is tried, which, so far 

 as it is uncontaminatcd, can be nearly wdioHy absorbed by 

 the re-agents employed, the process becomes exceedingly 

 simple; for if the residuum is under a hundred part of the 

 n'.casurc, it may be transferred completely into the graduated 

 tube, and its quantity at once ascertained. 



The 



