Chemical Apparatus. 



355 



rine is evolved ; which being heavier than atmospheric air, 

 soon occupies the greater part of the jar, the air being ex- 

 pelled through the aperture, by which the beak of the retort 

 enters, without closing it air tight. The retort being remov- 

 ed, and the hole well corked, the cavity in the key of the 

 cock is duly charged with pulverised antimony, which on 

 turning the key half round, falls through the chlorine, and 

 is converted, as it falls, into a shower of fire. Considerable 

 expansion ensues ; but the bladder receives so large a por- 

 tion of air, as to prevent any explosion ; while the cock, be- 

 ing, from its construction, always closed, and the junctures 

 being tight, the spectators are protected from the noxious 

 fumes. 



Apparatus for the combustion of metallic leaves, in chlorine. 



The ends of a glass cock are severally cemented into the 

 perforated necks of two bell glasses, A, B, one of them 



