THE MICROSCOPE IN SECTION. 



i. Compensation ocvitar ■ 12; it is a positive 



ocular. 

 -> Draw-tube, by which the tube is lengthened 



or shortened. 



3. Main tube or body, to the lower end of which 



the objective or revolving nose-piece is 

 attached. 



4. Society screw in the lower end of the 



draw-tube. 



5. Society screw in the lower end of the 



tube. 



6. Objective in position. 



7. Stage, under which is the substage with the 



substage condenser. 

 R. Spring clip for holding the specimen. 



9. Screw for centering, and handle of the 

 iris diaphragm in the achromatic con- 

 denser (see Fig. 41). 



10. Iris diaphragm outside the principal focus 



of the condenser for use in centering 



(§77). 



11. Mirror with plane and concave faces. 



12. Horse-shoe base. 



13. Rack and pinion lor the substage conden- 



ser. 

 i/| Flexible pillar. 

 is.- I 'art nf pillar with spiral spring of fine 



adjustment, 

 m. Screw of line adjustment. 

 17. Milled head of coarse adjustment. 



