| Date | 1800 |
| Author | Anon. |
| Contribution | Many attempts in early years of Century to make achromatic objectives. |
| Reference | Bradbury |
| Notes | Inspired by mid-18th Century discovery that, despite Newton's views, it was possible to make telescope lens with considerable correction of chromatic and spherical aberration. Application to microscope had limited success. |
| Category | Microscopy |
| Pathogen Class | General |
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