| Date | 1825 |
| Author | Chevallier |
| Contribution | Made objectives of Selligue type, but with the flat surface of the plano-concave lens facing the object. |
| Reference | Anon. |
| Notes | This gave less spherical aberration. If the spelling of his name is correct, this presumably refers to Jean Chevallier of Paris (1778-1848). Bradbury refers to Chevallier's work on Selligue type of multiple-lens microscope in 1824. |
| Category | Microscopy |
| Pathogen Class | General |
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