380 PNEtTMATIG APPARATUS. 



Improved ap- however, gently press them to prevent accidents. This ap- 

 Sfeingthe Paratus may be so far reduced in size, that, on a small so le, 

 gases. all operations, on gasses only to be confined over mercury, 



may be performed with about four or five pounds of mer- 

 cury : which may, in many eases, be an object of attention 

 to the philosophical chemist. 



Fig. I, (^aj The under plate ; the dotted line marks the cir- 

 cumference of the mouth of the magazine jar. 

 ('bj The upper plate. 



(^cj The third plate ; the dots mark the circumfer- 

 ence of the mouth of the small jar. The small dark 

 circle shews the place of the holes. 



Fjg. I. fa b e) The section of the plates, (as in Fig.i.) 

 (d) The magazine jar. 



(c) The small jar. 



(f) The dotted jar shews how the small jar is placed, 

 together with the third plate (e), before it is slided 

 across the edges (g) of that and the upper plate. 



Fig- 3- (ah c) The plates as before, but fixed in, 

 (h) The frame. 



(d) The lower or magazine jar, (as wedged tip 

 against the under plate, by 



(li) The moveable bottom. 



(e) The small jar to be filled with gas from the 

 lower jar. 



Fig;. 4, A small Apparatus for opperailng ivith Mtrcury, 



(ale) The plates as before. 



(d) The small jar, four inches high, with a, broad 

 rim, by which the lower plate may be confined to 

 its mouth, together with a frame in which the 

 upper and third plates may slide. This frame may 

 be made of hard wood, of ivory, or of iron. 



(g) A section of a wooden box, to hold as much 

 mercury as will cover the plates an J frame, and 

 ridmit the bent tube of 



(Ir) 



