Directions for use of Dark fie! aratus. 



1. Use very thin films, with few bubbles. 



2. Have alllenses very clean. 



3. Attac . :us. 



4. Remove all other condensers. 



5. Funnel stop in oil immersion obj . 



6. Center condenser with #3 obj. 



7. Drop of oil on condenser ana put sliae on 



oil. No^ oil on slide. 



8. Examine with low power. Center light by 



mirro r. 

 Focus condenser by lever. 



9. Oil on 1/12 - swin:.: in obj. 

 Proceed 



Feep lens on lamp iri place. 



row light on upp -*r part of mirror. 

 Use t r a in slide. 

 Do not use scratched slides. 

 5' pal slide wi t h vas el ine 

 Oil s: o uld be cl ear . 



