LADD S STUDENT S MICROSCOPE. 



67 



the stage, from which there project upwards through slits in the 

 stage a pair of steel bars, whose edges are just enough above the 

 surface of the stage to prevent its being touched by the loose steel 

 bar that lies across them as a ' keeper. ' This bar may be slid in 



Fig. 36. 



Ladd's Student's Microscope. 



any direction with the greatest facility ; but it is held to the magnet 

 bars with sufficient tenacity to remain in any position in which it 

 may be placed, and to support in that position any moderate 

 weight, so as to afford adequate support to the object-slide or 



f 2 



