CH. //.] 



/-.//'( )R. I n )JiY MICROSOPES. 



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60 50 40 30 20 10 



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Fig. 70,7 .—Spencer- Winkelform of Mechanical Stage. It is readily attachable 



to any microscope with rectangular stage, by two clamping screws on the right. 

 Its range of motion is about 3 o X 60 mm., thus enabling one to study as large a 

 series as is usually put on an ordinary slide. 



Fig. job. —{See next page.) Spencer Lens Company's Microscope No. 1. This 

 microscope is also furnished with a tube and oculars of the same diameter as those 

 oil the Zeiss microscopes for investigators who prefer the small tube. 



