By means of this apparatus, jars of any size may be used 

 as magazines, without the inconvenience of being obhged 

 to invert them in large troughs. 



This apparatus, also, on a smaller scale, may be used in 

 operating with those gasses which can only be confiaied over 

 mercury. The joints of the transferring plates retain very 

 securely any quantity of mercury, provided the height of 

 the jar is inconsiderable, not more than three or four inches, 

 for reasons well known to experimental philosophers. And 

 small jars, with ground mouths, hold mercury very well, 

 when standing, without agitation, with their mouths down- 

 wards, on ground plates of glass. The careful operator will, 

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

 paratus may be so far reduced in size, that, on a small scale, 

 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 cases, be an object of attention 

 to the philosophical chemist. 



FIG. 1. 



(«) The under plate; the dotted line marks the circumference of the 

 mouth of the magazine jar. 



(b) The upper plate. 



(c) The third plate; the dots mark the circumference of the mouth 

 ''"' of the small jar. The small dark circle shews the place of 



the holes. 



FIG. 



