| Date | 1877 |
| Author | Powell |
| Contribution | With Lealand, made water-immersion objective of 1/8" focus and numerical aperture of 1.26. |
| Reference | Bradbury |
| Notes | Such lenses matched the aperture of some of the early oil-immersion lenses of Abbe (1.20 - 1.35) and their observations may have been better corrected. See 1878. See Chapter 7, Table 3 (and perhaps elswhere) in Bradbury. |
| Category | Microscopy |
| Pathogen Class | General |
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