File:Voyage in Space page092.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:16, 20 December 2015 | 1,452 × 1,223 (159 KB) | Keith Edkins | {{Information |Description={{en|1=Design for a refracting telescope by Johannes Hevelius. There is not a closed tube, rather a series of circular diaphragms.}} |Source=A Voyage in Space[https://archive.org/details/voyageinspacecou00turnrich]. |Author=... |
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