190 Mr. Faraday on some new Products 



more chlorine combined with the substance, muriatic acid was 

 formed, and ultimately a fluid tenacious triple compound of 

 chlorine, carbon, and hydrogen was obtained ; but no chlo- 

 ride of carbon. This is a remarkable circumstance, and as- 

 sists in showing that though the elements are the same, and 

 in the same proportions as in olefiant gas, they are in a very 

 different state of combination. 



The tension of the most volatile part of the condensed oil 

 gas liquid, and indeed of the substance next beneath olefiant 

 gas in elasticity existing in the mixture constituting oil gas, 

 appears to be equal to about 4- atmospheres at the tempera- 

 ture of 60°. To ascertain this a tube was prepared, like the 

 one* delineated in the sketch, fig. 1, containing a mercurial 



Fig. 2. 



gauge at o, c, and the extremities being open. It was then 

 cooled to 0° from a to b, and in that state made the receiver 

 into which the first product from a portion of the original fluid 

 was distilled. The part at b was then closed by a spirit lamp ; 

 and having raised enough vapour to make it issue at c, that 

 was also closed. The instrument now placed as at fig. 2 

 had a and d cooled to 0°, whilst the fluid collected in b was 

 warmed by the hand or the air ; and when a portion had col- 

 lected in d sufficient for the purpose, the whole instrument 

 was immersed in water at 60° ; and before the vapour had re- 

 turned and been all dissolved by the liquid at b, the pressure 

 upon the gauge within was noted. Sometimes the fluid at d was 

 rectified by warming that part of the tube, and cooling a only, 

 the re-absorption at b being prevented or rather retai'ded in 

 consequence of the superior levity of the fluid aX, d; so that 

 the first portions which returned to b lay upon it in a stra- 



* The particular inclination of the parts of the tube one to another 

 was given, that the fluid, when required, might be returned from a to d 

 without passing on to b. 



tum, 



