

Vui. 1.- A A, Uubbor bandf ia Euitable gicoves. to 

 carry cover glass ; B B, grooves to receive rubber 

 baodB. 



Fio. 2. — The same closed. 



kUGLK ^ 



V.ICROSCOPICAL C()MHHi:-SOR. 



Not Patented. 



