| Date | 1830 |
| Author | Chevalier |
| Contribution | Improved the simple microscope. |
| Reference | Bradbury |
| Notes | Exact date is uncertain. Chevalier (presumably Charles Chevalier of Paris) used two plano-convex lenses in the manner of Wollaston (see 1829) but inserted a stop between them to give a sharper image. |
| Category | Microscopy |
| Pathogen Class | General |
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