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Summary
| Description |
English: Leiden Observatory Centennary, 1961. Left to right: Jan Oort, Hendrik C. van de Hulst, Pieter Oosterhoff. 18th century Gregorian reflector telescope, built around 1750 by the Amsterdam instrument maker Adam Steitz for the Amsterdam merchant Jacobus van der Wall. |
| Date | |
| Source | GaHetNa (Nationaal Archief NL) 912-4534 |
| Author | Joop van Bilsen (ANEFO) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 21:18, 14 August 2024 | | 3,962 × 3,304 (1.84 MB) | Vysotsky | Cropped 4 % horizontally, 4 % areawise using CropTool with precise mode. |
| 23:42, 19 January 2017 |  | 4,128 × 3,304 (1.93 MB) | Vysotsky | User created page with UploadWizard |
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