Analyjls of the Air. 1 89 



Experiment LXXVIL 



To prevent which, I make ufe of the fol- 

 lowing method of diftillation, which is 

 much more commodious than with Glafs 

 Retorts, whofe juncture at a (Fig. 33.) it is 

 not eafy to fecure. Having firft put the 

 matter to be diftilled into the iron retorc 

 r r (Fig. 38.) which was made of a musket 

 barrel, I then fixed a leaden fyphon to the 

 nofe of the retort ; and having immerfed 

 the fyphon in the veflel of water x x> I 

 placed over the open end of the fyphon the 

 inverted chymical receiver a b> which was 

 full of water j fo that, as the air which was 

 raifed in diftillation, pafled thro' the water 

 up to the top of the receiver a b, a good 

 part of the acid fpirit and fulphureous fumes 

 were by this means intercepted and retain- 

 ed in the water 5 the confequence of which 

 was, that the new generated air continued 

 in a more permanently elaftick ftate, very 

 little of it lofing its elafticity, viz. not 

 above a 15th or 18th part, and that chiefly 

 the firft 24 hours; after which the remain- 

 der continued in a conftantly elaftick ftate ; 

 excepting the airs of tartar and cakullus hu- 

 mmts, which- in 6 or 8* days loft conftantly 



above 



