CM. II] 



LABORA TORY MICROSCOPES 



83 



Fig. 76. The Bausch d~ Lomb Optical Co' s 

 Detachable Mechanical Stage. 



Fig. 77. The Detachable Mechani- 

 cal Stage of Leitz, 



Fig. 78. 77/i? Spencer Lens Co' s Detachable Mechanical 

 Slan-e of Great Range. 



