| Date | 1873 |
| Author | Abbe |
| Contribution | a. Published new theoretical basis for image formation in microscopy. Introduced concept of numerical aperture. |
| Reference | Bradbury |
| Notes | Ernst Abbe had become technical advisor to firm of Carl Zeiss in 1866, and was later to become partner and then proprietor. He was major factor in making it possible for his compatriots to become leaders in the development of the germ theory. |
| Category | Microscopy |
| Pathogen Class | General |
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