| Date | 1837 |
| Author | Ross |
| Contribution | Began making achromatic microscope objectives by Lister's formulas. |
| Reference | Bradbury |
| Notes | They set a new standard, and included (by 1841) a 1/8 inch objective, consisting of two doublets and a triplet, and having an angular aperture of 63 degrees. By 1842 he had made one with an aperture of 74 degrees. |
| Category | Microscopy |
| Pathogen Class | General |
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