THE COMPOUND MICROSCOPE. 
The compound microscope, as used in the laboratory to 
study very small objects, consists of two distinct parts, — 
the mechanical part (stand), and the magnifying part 
(lenses). 
A. The Stand. 
1. The base is the part which rests on the table. 
2. The column is the vertical portion which is attached 
to the base and supports the other parts. Has it 
ahinge? Ifso, why? 
3. The stage is the horizontal shelf which is attached to 
the column. Observe the opening in the center 
of the stage. 
4. The rotary disk, if present, is fastened to the under 
side of the stage, and has openings of different 
sizes. How is it turned, and what is its purpose? 
If not present, what takes the place of it? 
5. The mirror is situated below the stage. To what is 
it attached? In how many directions can it be 
turned? Why? Are its two surfaces alike, and 
if not, how do they differ? Of what use is the 
mirror ? 
6. The tube in some instruments is held in the sleeve, 
which, in turn, is connected with the upper part 
of the column by an arm. ‘To. raise or lower the 
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