8o 



LA BORA TOR Y MICROSCOPES 



\_CH. II 



Fig. 79. A. Queen & Co' s Continental Microscope, No. II. B. Dust-prooj, 

 triple nose-piece . The difference between this and the ordinary form can be seen 

 by comparing with Fig. 36. This form of revolving nose-piece has been made for 

 many years by Winkel of Goettingen. 



