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B. Medium Stand (Fig. 16). 
This stand is similar to the preceding one, but smaller in 
size, which corresponds with that of our stand IV. It is inclinable, 
is fitted with the same arrangement of the illuminating apparatus, 
the stage, the coarse and fine adjustment of tube, the fittings for 
Klein's quartz plate and the analyser, and has the same centering 
objective-holder. It is, however, adapted for the eye-piece 
No. 50 for the observation of axial images and is supplied 
without the Amici lens. 
With condenser, polariser, analyser, Klein's quarz plate 
The following special illuminating apparatus may be used with 
these two stands, viz : 
No. 21, lUnminating apparatus for monochromatic light 
after Hartnack 
No. 22, Micro-spectral ohjectivc after Engelmann . . . 
No. 23, Spectro-polariser after Rollet 
These may by means of the centering collar supplied with 
them be fixed and adjusted in the sleeve of the condenser system 
by the observer. 
