| Date | 1864 |
| Author | Steinheil |
| Contribution | Introduced improved triplet lens for the simple microscope. |
| Reference | Bradbury |
| Notes | In Bradbury's subject index, not person index! The triplet made use of cemented lenses of different kinds of glass, and is the principle used in modern magnifiers of 5x to 20x power. |
| Category | Microscopy |
| Pathogen Class | General |
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