LIST OF ILLUSTRATIONS. 



[The figures contained in this book are intended to illustrate special 

 features described in the text, and should not be regarded as recom- 

 mendations of any particular instruments or makers ; at the same 



time, only such firms are mentioned as are actual manufacturers, and 

 whose work is reliable and of the first grade.] 



FID. PAGE 



A Typical Modern Microscope - - Frontispiece 



1. A Typical Student's Microscope - 8 



2. Typical Continental Microscope - 12 



3. View of Diagonal Eackwork - - 19 



4. Sectional View of Adjustable Fittings of Eack and Pinion 19 



5. Section of Limb of Microscope to show System of Fine 



Adjustment - 23 



6. 'Imperial' Microscope by E. and J. Beck - 25 



7. Spindle Milled Head for giving Two Speeds to Fine Adjust- 



ment ; - 26 



8. A Popular Binocular Microscope -• 32 



9. Simple Dissecting Microscope 35 



10. The Aplanatic Magnifier 35 



11. Metallurgical Microscope - 37 



12. Holder for Metallurgical Work 38 



13. Travellers' Microscope 39 



14. Petrological Microscope 41 



15. Stand VI., by Leitz - 43 



16. Mechanical Stage showing the ' Sprung ' Fittings with 



Adjusting Screws - - 46 



17. Abbe's Apertometer 63 



18. Correction Collar (Zeiss) 66 



19. The Abbe Test Plate - 72 



20. Huyghenian Eyepiece 77 



21. Holoscopic Eyepiece 80 



22. Projection Eyepiece - 81 



23. Zeiss's Binocular Eyepiece - 83 



24. Abbe Illuminator (1-20 Optical Part) 89 



25. C. Baker's Achromatic Condenser 91 



26. Iris Diaphragm as fitted to the Condenser Carrier 92 



27. 1 



go" I Apertures of Condensers - 94 



m. ) 



31. Image of Lamp-flame - 96 



