| Date | 1838 |
| Author | Ross |
| Contribution | Made an objective that provided correction for the thickness of cover slips. |
| Reference | Bradbury |
| Notes | Andrew Ross. Cover slips were then becoming popular, but reintroduced spherical aberrations in the objectives (which had only recently been corrected). Ross worked according to principles laid down by J. J. Lister. |
| Category | Microscopy |
| Pathogen Class | General |
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