.4 



s 

 s 



Analyfis of the Air. 119 



fumes Were at the fame time destroying the 

 elafticity of the air. I took care to make 

 the air in both tubes of the fame tempera- 

 ture, by firft immerfing them in cold water, 

 before I comprcifed them. 





■ 





1 

 .- 



I** 



to z z 



Experiment C VI. 



I fet a lighted tallow Candle, which was 

 about h of an inch diameter, under the in- 

 verted receiver z z a a, ( Fig. 35-) and with 

 a fyphon I immediately drew the water up 



Then drawing out the fyphon, the 

 water would defcend for a quarter of a mi- 

 nute, and after that afcend, notwithstand- 

 ing the Candle continued burning, and heat- 

 ing the air for near 3 minutes. It was ob- 

 fcrvablc in this Experiment, that the fur- 

 face of the water z z did not afcend with 

 an equal progrcflion, but would be fome- 

 times ftationaryj and it would fometime s 

 move with a flow, and fometimes with an 

 accelerated motion j but the denfer the fumes 

 the fader it afcended. As foon as the Can- 

 dle was out, I marked the height of the_ 

 water above z z, which difference was e- 

 qual to the quantity of air, whofe elaf- 



Q> l ticley 



'i«i 







