STAGE APPLIANCES 



339 



FIG. 285. Stage-forcepe. 



brass^ box filled with cork, and perforated with holes in its side, 

 seen in fig. 286 ; this affords a secure hold to common pins, to the 

 heads of which small objects can be attached by gum, or to which 

 discs of card. Arc., may be attached, whereon objects are mounted 

 for being viewed with the Lieberkiihn. This method of mountini; 

 was formerly much in vogue, but has been less employed of late. 

 since the Lieberkiihn has unfortunately fallen into comparative 

 disuse. The forceps in fig. 287 are also often of great practical value, 

 and are adjusted for holding by a screw. That which is known as 

 the stage-rice, for the 

 purpose of holding small 

 hard bodies, such as 

 minerals, apt to be jerked 

 out by the angularmotii >n 

 of the blades of the for- 

 ceps, or very delicate 

 substances that will not 

 bear rough compression, 

 is very useful, and is seen 

 in fig. 288. The stage 

 vice fits into a plate, as 



is the case with Heck's Stage-forceps, 



disc-holder, fig. 289, or 

 it may simply drop into 

 a stage fitting, as in the 

 figure. 



For the examination 

 of objects which cannot 

 be conveniently held in 

 the stage-forceps, but 

 which can be temporarily 

 or permanently attached 

 to discs, no means is 

 comparable to the disc- 

 holder of Mr. R. Beck 

 (fig. 289) in regard to 

 the facility it affords for 

 presenting them in every 

 variety of position . The 

 object being attached by 

 gum (having a small 

 quantity of glycerine 

 mixed with it) or bv 

 gold size to the surface of a small blackened metallic disc, this i> 

 fitted by a short stem projecting from its under surface into a 

 cylindrical holder ; and the holder carrying the disc can be made to 

 rotate around a vertical axis by turning the milled head on the 

 right, which acts on it by means of a small chain that works through 

 the horizontal tubular stem ; whilst it can be made to incline to one 

 side or to the other, until its plane becomes vertical, by turning 

 the whole movement on the horizontal axis of its cylindrical 



tj 



z 2 



FIG. -J.sT. 

 Three-pronged forceps, screw adjustment. 



FIG. -JMS. The stasje-vice. 





FIG. -280. Beck's disc-holder. 



