LIST OF ILLUSTRATIONS IN THE TEXT 



FIG. PAGE 



1. Camera with sliding car- 



riers 7 



2. Arrangement for enlarg- 



ing camera ... 8 



3. Watson's Laboratory ca- 



mera . . . .12 



4. Reflex vertical camera . 14 



5. Vertical camera . .16 



6. Bausch and Lomb's ver- 



tical and horizontal 

 camera . . . .17 



7. Leitz' large photomicro- '' 



graphic camera . .18 



8. Mr. Barnard's geometric 



slide photomicrographic 

 apparatus ... 20 



9. Simple box camera . 21 



10. Simple vertical camera 



for instantaneous ex- 

 posures .... 23 



11. Sliding objective changer 30 



12. Premier microscope . 36 



13. Circuit stage Van Heurck 38 



14. Spencer microscope No. 10 40 



15. Zeiss' microscope No. 1 . 42 



16. Leitz' microscope A 



17. Pv.M.S. microscope . . 



18. Edinburgh Students' mi- 



croscope H . 



19. Diagram, Spherical aber- 

 20. 



ration .... 



Diagram, Chromatic aber- 

 ration 



48 



FIG. PAGE 



21. Comparison of oil immer- 



sion and dry systems . 68 



22. Mechanical and Optical 



tube lengths . .71 



23. Projection eyepiece . 73 



24. Zeiss' 5-ampere auto- 



matic arc lamp . .87 



25. Enclosed arc lamp . . 90 



26. Zeiss' Nernst lamp . .91 



27. The Hageh mercury va- 



pour lamp . . .93. 



28. Injector jet . . . 96 



29. Incandescent gas lamp . 97 



30. Oil lamp with adjustable 



condenser and screens 99 



31. Bull's-eye condenser with 



iris on adjustable stand 104 



32. Nelson's aplanatic con- 



denser . . . .106 



33. Abbe condenser . .107 



34. Low power illuminator 



by Swift . . .108 



35. Achromatic condenser, 



Watson's Universal . 108 



36. Aplanatic oil immersion 



condenser by Leitz . 109- 



37. Swift's apochromatic con- 



denser . . . .110 



38. Diagram of illumination 



with auxiliary con - 

 denser . . . - 124 



39. Diagram of illumination 



by means of two auxi- 

 liary condensers . .125 



xi 



