| Date | 1873 |
| Author | Abbe |
| Contribution | b. Developed a two-lens condenser ("illuminator") for use with his objectives. |
| Reference | Anon. |
| Notes | Two-lens condensers had been used periodically since the 18th. Century, but Abbe popularized their use. |
| Category | Microscopy |
| Pathogen Class | General |
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